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It was imported into the UXP platform, which is shared by Serpent, NM, BNavigator, and MailNews. But it probably only affects MailNews, not the others. Sort of a weird situation: it works on XP (because it doesn't have WMF at all), and also on Win 7, but not on Vista (unless you disable WMF, a cure generally worse than the disease).

A site-specific user agent override should fix that specific issue, letting you at least download add-ons from ATN (though you'll still need to patch them after downloading as @TechnoRelic explained). Go into about:config and create a new string preference general.useragent.override.addons.thunderbird.net and set it to Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0 SeaMonkey/2.49.5.

Serpent, at least, should have very few problems with legacycollector.org. Improving support for AMO would require porting more WebEx APIs from FF 54+; I'm gonna go out on a limb and say that wouldn't be easy. As for ATN.... BNavigator / MailNews are unique since MAT restarted their version numbering. Most extensions are compatible but don't realize they're compatible, so they refuse to install. BNav probably needs a "Seamonkey compatibility" mode in which it pretends to be SM 2.49.6 or something for purposes of installing add-ons.

This will be fixed in the upcoming release.

I would advise against this setting for those combinations of Windows OSes (Vista SP2 and up) and GPUs where hardware video (h264) decoding is actually possible and the default; disabling HVD delegates h264 decoding to the CPU, which may have (depending on the CPU) a significant performance toll (especially on high res videos) ... Additionally, I'm not quite sure whether the above "media." pref has any actual bearing on XP (where HVD via WMF is not possible) ...

You may be right; unlike @roytam1's browsers, stock FF 52 ESR requires something extra, like Adobe Primetime, to decode h.264 videos on XP. But the OP said the problem was only in Instagram. If Facebook/YouTube are working it sounds like he's over the h.264 hurdle already. So, IDK; we'll see what he says, I guess....

Yes, I have verified that on a Win7SP1 64-bit laptop, where the same Serpent 52.9.0 32-bit build will have no problem playing back Twitter gifs with Win7's native WMF h264 decoder , whereas on Vista it would barf, as already posted... FWIW, Vista's WMF implementation (which requires SP2 to be present) is notably inferior to the one present in Win7; Win7 OEM was released with native h264 decoding support present, while on Vista it was implemented via post-SP2 Microsoft updates (and, I suspect, as best as Vista's then internals would allow... ).

Is this really imported to Serpent? But I don't see any mail or news related functions.

No apology necessary! I was just exercising "due diligence." If changing the user agent always fixes the issue, that means there's no reason to retain Adobe Primetime support in Serpent 52 - the built-in ffvpx is adequate. And that's one less thing for @roytam1 to have to worry about reverting.

Sorry; I should have said "extensions," not "add-ons." Themes don't rely on WebEx APIs, AFAIK. Examples: Serpent 55 runs the "Multi-Account Containers" extension; Serpent 52 does not. Serpent 55 supports somewhat newer versions of "Empty Cache Button" and "uBlock Origin" than Serpent 52.

Fellow Vista Home Premium SP2 32-bit user here ; on Vista, there seems to be a conflict/incompatibility between the native WMF h264 decoder (not present in XP) and certain gif formats, like the Twitter ones ; the ffmpeg-based h264 decoder present inside @roytam1 's custom-patched ffvpx library is still capable of rendering those gifs though, but has a lower value (in the preferred order) and is thus not used by default on Vista (while it is on XP, which lacks WMF); so, your issue is Vista specific... To view such Twitter gifs on Vista, temporarily set (in about:config) media.wmf.enabled to false and reload the twitter page; the gif should play now (because ffvpx takes over...) NB: I'd advise against making this a permanent pref change, as the WMF framework is better suited for media playback integration with UXP browsers under Vista (e.g., if your gfx card supports hardware (i.e. GPU) h264 decoding, it can make use of that, while ffvpx always uses software (i.e. CPU) decoding) ! Best regards

Yes correction I have copied over 1st torrent files. Glad you have point all things out. On WinME the files were laid out different to Win7 there was Public; Public-1; Public-2; with same files inside. I better not ramble on anymore & new thread sounds a good idea.

New build of BOC/UXP for XP! Test binary: MailNews Win32 https://o.rths.ml/boc-uxp/mailnews.win32-20191123-39ebd519-uxp-21fdc3e93-xpmod.7z Browser-only Suite Win32 https://o.rths.ml/boc-uxp/bnavigator.win32-20191123-39ebd519-uxp-21fdc3e93-xpmod.7z source patch (excluding UXP): https://o.rths.ml/boc-uxp/boc-uxp-src-xpmod-20191123.7z Official repo changes since my last build: - [UXP] Update commit pointer (157a2bbf) - Change commit pointer to branch (fb98c7c7) - Remove mailnews and friends (1c2512a6) - [Mail] Fix paths to mailnews (de0ce3cd) - [Mail] Adjust confvars (eaefa219) - [UXP] Update branch commit pointer (fb5b9c36) - [Mail] Add changes to align with mailnews (096b6e05) - [Mail] Clean up configure.in (cfdfcc94) - [UXP] Update branch commit pointer (8d322eac) - [UXP] Update branch commit pointer (5c596add) - [UXP] Update branch commit pointer (467a415b) - [UXP] Update branch commit pointer (96adaf66) - [UXP] Update branch commit pointer (f3b11ae2) - Bug 1320475 - Fix broken controllers for cmd_printcard and cmd_printcardpreview. (c1da214e) - Update .gitignore (a8732dad) - Update fake-mach stub (eb640230) - [UXP] Update branch commit pointer (e01179b2) - Bug 342632 - Allow defaultAccount to return success with nullptr result when there is no usable account. (da050b92) - Bug 1020971 - Port bug 1015664: Remove NS_HIDDEN and friends. (016cb08e) - [UXP] Update branch commit pointer (84c6c823) - Bug 1423487 - Support multiple authors in RSS feeds. (a5bc7f38) - [UXP] Update branch commit pointer (68298d1b) - Bug 1528496 - Correctly fix Bug 1023285 and utf8 addressing header display for jsmime. (dff1d116) - Bug 1338715 - Remove Outlook Express import (13a4ff9f) - [UXP] Update branch commit pointer (52b14cfc) - Bug 1558595 and 1240290 (e451df7a) - [UXP] Update branch commit pointer (46b70ca0) - Revert "[MAIL] Remove unused unstable branding" (ff72bc5f) - [Mail] Include the eula in the unstable branding (6d3c3e8f) - [Mail] Correct typo in MsgComposeCommands.js (6948ca58) - [UXP] Update branch commit (54c8f952) - Revert "[Mail] Correct typo in MsgComposeCommands.js" (df8fd63d) - Follow up to Bug 342632 (03fe1480) - Another follow up to Bug 342632 (0078587c) - blah blah blah commit pointer or something (da80f36e) - Generate the json build artifact when stage-package (3147ce4e) - Update branch commit pointer (30c2a0c3) - [Mail] Use 7zip for packaging (01f78596) - Update branch commit pointer (39ebd519) My changes since my last build: - Reverted Bug 1338715 - Remove Outlook Express import (13a4ff9f) - [UXP] a moz.build hack for keeping tree able to build For UXP changes please see above.

New build of Serpent/UXP for XP! Test binary: Win32 https://o.rths.ml/basilisk/basilisk52-g4.4.win32-git-20191123-21fdc3e93-xpmod.7z Win64 https://o.rths.ml/basilisk/basilisk52-g4.4.win64-git-20191123-21fdc3e93-xpmod.7z source code that is comparable to my current working tree is available here: https://github.com/roytam1/UXP/commits/custom NM28XP build: Win32 https://o.rths.ml/palemoon/palemoon-28.8.0a1.win32-git-20191123-21fdc3e93-xpmod.7z Win64 https://o.rths.ml/palemoon/palemoon-28.8.0a1.win64-git-20191123-21fdc3e93-xpmod.7z Official repo changes since my last build: - Issue #1258 - Part 1: Import mailnews, ldap, and mork from comm-esr52.9.1 (302bf1b52) - Merge branch 'master' into mailnews-work (2d4aca6d0) - Issue #1258 - Part 2: Use binoc-central version of ldap (6513e41cb) - Merge branch 'master' into mailnews-work (a57983a21) - Issue #1258 - Part 3: Make mailnews and friends build (6e7b3df37) - Issue #1258 - Part 4: Remove Add IM Account from Account Manager (1f23280e6) - Issue #1258 - Part 5: Only IceDove cares about Thunderbird's baby mode account creation (5d18a70aa) - Issue #1258 - Part 6: Add MOZ_MOVEMAIL to MOZ_MAILNEWS configure logic (37fbbd447) - Issue #1258 - Part 7: UXP Specific fixes (711a5031d) - Merge branch 'master' into mailnews-work (714afc76f) - Issue #1258 - Part 8: Ifdef MailNews OAuth2 Support (03590a671) - Merge branch 'master' into mailnews-work (b0e23e79e) - Bug 1328847 - Change SEC_NORMAL to SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL where system principal is used. (bbf10b909) - Bug 516464 - Remove passwords from cache when password manager contents are changed to prevent stale password attempts. (74e5265d3) - Bug 1461106 - Remove SMTP password from cache when deleted from password manager to prevent stale connection attempts. (58a7cff16) - Bug 1404049 - fix that mail.imap.use_literal_plus set to false may have no effect. (02dc2390e) - Bug 1079280 - Don't transmit email when imap append response is bad. (5393f033b) - Bug 1227761 - Fix logic error in BuildAttachmentList(). (1ec388b23) - Bug 1427732 - fix newline handling when copying messages and compacting folders. (e60090bc9) - Issue #1273 - Remove Telemetry from Gloda (4db1ae892) - Bug 1487082 - Resolve potential for build bustage regarding bad implicit conversion constructors (201683afe) - Bug 646901 - add error checking to fix crash in nsMsgXFVirtualFolderDBView::OnSearchHit(). (818c1df5e) - Bug 1462316 - fix crash in nsAbView::OnItemAdded(). (ba48342fa) - Bug 825513 - Fix crash in nsImapProtocol::GetMessageSize() by adding null check for m_runningUrl && m_hostSessionList. (993a6bc1d) - Bug 1393219 - Code clean-up: Style nits, typos and trailing spaces (9ae2525b9) - Bug 1399756 - (More) Code clean-up: Style nits, typos and trailing spaces (713dca2fd) - Bug 1416033 - remove some unneeded includes in mailnews (a2a658f88) - Revert "Issue #1273 - Remove Telemetry from Gloda" (4d6dbd35f) - Bug 1216951 - Fix broken handling of split CR and LF between chunks. (81dd13387) - Bug 1444389 - Fix crash in nsImapProtocol::HandleMessageDownLoadLine(). (4d20783c0) - Bug 1317117 - call msgStore folder deletion during imap/news empty trash. (1f5f6a4bf) - Bug 1442648 - Fix mismatched types in mingw-w64 builds (const char16_t*/char16ptr_t). (e661493bb) - Bug 145113 - Make "next chunk starts with newline" flag a member variable to fix MOZ_ASSERT(). (fdcb16661) - Bug 1494764 - Removed MOZ_ASSERT but now still process line where it would occur. (05667b0d4) - Bug 1333038 - Use 'modern' pointers to fix crash due to nsMsgLineStreamBuffer object being deleted while still in use. (cea77b76b) - Bug 1257058 - Distinguish 'empty password' from no password received to avoid shutdown crash. (97826b14c) - Bug 344205 - React correctly to NO/BAD tagged response to imap IDLE. (43919ab8c) - Bug 1320475 - Fix broken controllers for cmd_printcard and cmd_printcardpreview. (0a8849ad6) - Bug 1507718 - crash in nsImapProtocol::GetMessageSize(). Make m_hostSessionList an nsCOMPtr. (891ca8709) - Bug 1508046 - return cleanly in LDAP autocomplete search if we are offline. (2fda56a84) - Bug 342632 - Allow defaultAccount to return success with nullptr result when there is no usable account. (5d21f962d) - Bug 1401858 - add null check to avoid crash in EncodedHeader()/DecodedHeader(). (fa9ca98c3) - Bug 1271353 - check own email addresses case-insensitively in correspondents column and ignore plus addressing part. (6d5922ba8) - Bug 809513 - Prevent unread Drafts from showing in new mail notification. (2fa79c837) - Bug 390721 - When parsing headers to cancel an article, also use folded lines. (c5a0af052) - Bugs 1512557 and 1470716 - Convert nsIStringBundle pointers to nsCOMPtrs and release them when shutting down. (66c5b1105) - Bug 906469 - fix maildir crash while parsing a folder. (d80e610cd) - Bug 1517464 - Fix crash in SMTP DTOR by properly initializing/testing pointer. (22973db50) - Bug 393302 - Correct memory handling in MAPISendMail() and CMapiImp::SendMail() to fix "Send to > Mail Recipient" crash. (1d5ec356b) - Bug 1523048 - when copying a filter, copy its triggering events too (filterType). (05b84061f) - Bugs 1402750 and 1490331 - Declare the character set correctly in the 'PGP add-on is missing' message. (544e93daf) - Bugs 1507218 and 1528615 (38fe066bb) - Bug 1525120 - Fix condition for decoding attachments (base64/qp) when saving or forwarding. (fa711799b) - Bug 1495698 - Fix hang when HTML signature references non-existent image. (4b217ebe5) - Bug 1386601 - experimental patch to investigate Thunderbird topcrash, serializes S/MIME verification. (3d9db9cb3) - Bug 1508054 - reduce exposed API of nsMsgHdr. (31fea2bc2) - Bug 1546840 - Allow GloDa queries for read or unread messages (7922314fa) - Bug 1020971 - Port bug 1015664: Remove NS_HIDDEN and friends. (359334f1a) - Bug 971347 - Fix autoconfig vulnerable to active MITM attacks for all domains (including the ones in ISPDB) (4fdd9dac6) - Tails 6156 - Fix outdated error handling in accountcreation and remove buggy debug code (14ef56453) - Bug 522450 - Place mail copy on the correct folder when using Reply to List (bca2de131) - Bug 1167982 - Do charset detection for all text/* attachments in composition, not just text/plain. (0903ef356) - Bug 1423487 - Support multiple authors in RSS feeds. (0707a51ea) - Bug 1528496 - Correctly fix Bug 1023285 and utf8 addressing header display for jsmime. (43db6faf2) - Bug 1480063 - Remove mimeEncodeSubject (encodeMimePartIIStr_UTF8) from feeds. (20aab9e0c) - Bug 1554098 - deduce RSS media enclosures type from extension when missing. (3c41580e7) - Bug 1338715 - Remove Outlook Express import (7047b11cf) - Bug 1315662 - delete SMTP server login credentials when deleting the account or if hostname/username changes. (dc46cd9ec) - Bug 1558595 (2732b1a0b) - Bugs 1437282, 1438590, 1506587, and 1498795 (64f423eb4) - Bug 1568095 - Make morkAtom::GetYarn() static. (a081e71be) - Bug 1580187 - Add null check to avoid crash in nsImapService::NewChannel(). (dc77b707f) - Bug 1240290 (73e14fb70) - Bug 1584473 - Fix several issues (7406d488b) - Bug 786683 - check success of GetFilePath() throughout nsMsgBrkMBoxStore.cpp. (c6df8fffb) - Bug 726655 - Add null check in nsMsgDBView::GetThreadContainingMsgHdr() to avoid crash. (3260f2045) - Bug 1584473 - Follow-up: Remove leftover references to nsIMdbRowCellCursor::MakeCell() in comments. (d59e35c94) - Issue #1258 - Part 9: Add close-icon class to close button in newmailalert.xul (6d6759a78) - Issue #1258 - Follow up to Part 8: Ifdef MailNews OAuth2 Support (73cdfdcf3) - Issue #1258 - Part 10: Remove chat core bits (cc757e4e4) - Issue #1258 - Follow up to Part 8: Ifdef MailNews OAuth2 Support (6c4ed6504) - Manually revert Bug 1494764 - Removed MOZ_ASSERT but now still process line where it would occur. (9f00e5184) - Bug 1494764 - Removed MOZ_ASSERT but now still process line where it would occur. (f3611104b) - Issue #1258 - Follow up to Part 8: Ifdef MailNews OAuth2 Support (ecdfbc692) - Merge branch 'master' into mailnews-work (9308ec68e) - Merge branch 'master' into mailnews-work (1d30f6fa8) - Bug 1592407 - Port OAuth2 decoding fix from gData add-on. (f3d462c60) - Merge branch 'master' into mailnews-work (556349010) - Issue #1259 - Adjust Widewine strings after removing Adobe Primetime support (d03485712) - Issue #1288 - Use NS_DECL_THREADSAFE_ISUPPORTS in HttpBaseChannel.cpp (2f4fdced5) - Merge pull request #1294 from g4jc/bug_1288 (8a64845aa) - Merge pull request #1293 from JustOff/PR_widevine_strings (36c81a978) - Issue #1284 - Implement /s (dotAll) for regular expressions. (f31b04a30) - Revert "Issue #1284 - Implement /s (dotAll) for regular expressions." (bd529c60c) - Issue #457 - Fix typo in ipc/chromium/src/base/sys_info_posix.cc (35cc4c128) - Merge pull request #1297 from athenian200/compiler-warning (62a72e3d2) - Issue #1284 - Implement /s (dotAll) for regular expressions, v2. (122e1ee6c) - Issue #1284 - Update js/src/builtin/TestingFunctions.cpp for /s (dotAll) regular expression changes (0a6ccfaa9) - Merge pull request #1298 from g4jc/b1284 (47ca6f108) - Issue #1242 - Reinstate GPU Accelerated Windows entry in about:support (4f6a779e0) - Issue #447 - Update HSTS preload list (fcea217aa) - Remove duplicate localization note (e97cb2f75) - Issue #1251 - Remove obsolete XP_QSORT reference. (21fdc3e93) My changes since my last build: - restored XP compat in nsMessengerWinIntegration (593762743) - Hidden preference to toggle addon version in addon manager (#10) (#9) (d9fb4e872) - Reverted Bug 1338715 - Remove Outlook Express import (7047b11cf) - applied NSPR Bug 1586070 - Read does not advance file position for files larger than 4GB on Win32. (See also bug 70765.) r=kaie (97ea6ee95) - updated to nss-3.44.3 (eb4044be7)

advance notice: - firefox45esr will have a new build tomorrow - nm27/km76 are unlikely to have new builds tomorrow - sp55's update is still pending hoping it can be done on/before 30 Nov

@Tangy, @caliber, Look to change some rule in your extensions, and look to not block javascript entirely... First, to test, disable your JavaScript extension and other defenses: Test your JavaScript Browser Information by browserleaks.com: https://browserleaks.com/javascript JavaScript Inspector Know what JavaScript reveals about your browser: https://webbrowsertools.com/javascript/#javascript-uri Then I don't have problems with youtube.com home page, all videos are here and I could play them all. Then all Firefox based browsers roytam1 made I use, are very good, and better each week. - and I would like here and now to warmly thank dear roytam1 for all his efforts, to supply us with these always better browsers each week! Keep up the GREAT work! And thanks also to the other famous members who give us all so much valuable professional advices! Here on kangax.github.io you have, in the first line, your current browser characteristics: https://kangax.github.io/compat-table/es2016plus/

Deleting and then downloading the symbols again with the "sym_load.cmd" tool mentioned some pages before did it. Works for me when hitting "Cancel". Now waiting for bicmuscle ...

Any one interest in back porting pascal and crimson driver to XP please show some support here I have plan to put AMD driver into vista even as my friend asked me . Nvdia not provided driver to XP for their TitanXP we should start war against them . Even left XP with vulkan and some terrible bugs . Nvdia should have shame on them . Work of war :: * Back port their newer 7 driver to XP * Fine tune the driver to beat them *Enhance the driver for more better gfx output

If they run 10 x32, they ought to run 7 x32 even better. You sure they don't?