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... But you haven't answered in the question kindly asked by @roytam1: Have you tried a fresh New Moon 28.8.0a1 profile (with no extensions) and try gmail behaviour there? In your screenshot (where NM28 is run under Win7) I see you have installed uBlock Origin (legacy), Disconnect and NoScript; they are bound to conflict with each other - also bear in mind that NoScript is explicitly incompatible with Pale/New Moon and UXP based browsers, so it's better to be avoided! IMHO, your gmail issues arise from using too many/incompatible content/script blockers. Second, you were told earlier (I think in the original thread) that you are not to compare latest versions of browsers (latest Chrome and Chromium based forks, latest Firefox Quantum/Browser) with the older-Firefox based forks in terms of behaviour on heavily-scripted sites; Google and the rest of the gang (e.g Facebook) always target the latest browser versions on new era hardware and OSes (and it can be argued that browser vendors have to always catch up with Google and gang in order to retain compatibility with whatever alpha Javascript/CSS features they are implementing on their sites) ... You only have yourself to blame for this "great" problem of yours... New Moon is mainly targeted for XP (and for the few of us on Vista), where official PM won't run; thus, XP+Vista users of NM won't ever be faced with the problem you've created... As for NM+PM on Win7 and higher, what you report is to be expected - don't use both browsers, as, of course, they'll share the same profile location - but, and this is worse, New Moon isn't anymore just PM for XP; the codepaths have diverged (and this is even more pronounced in the case of Serpent52/Basilisk52); e.g., the NSS library used currently by MCP in official PM is different to the one used in NM, so expect profile corruption to occur when the same profile folder is being alternatively shared by the two browsers. If you still insist on using both NM28 and PM28 on the same computer (and windows account), then you should be using the official Pale Moon Portable package, http://www.palemoon.org/download.shtml#Portable_versions so that New Moon maintains a discrete profile and PM28-portable another discrete one... ======================================== To cure your self-inflicted issues: 1. Uninstall official PM28 2. Back-up the corrupted NM28 profile, in order to salvage what can be salvaged from there... 3. Delete the original, old (saved elsewhere), NM28 profile. 4. Make sure you have the latest NM28 version, launch it and you should be in a new fresh profile - then start anew with configuring it the way you like - but heed to step 5... 5. Avoid installing too many blockers - ublock0-legacy alone would suffice. 6. When you're finished configuring NM28, exit it. 7. "Install" the portable version of official PM28 - that version should always be launched via the palemoon-portable.exe launcher (you can create a desktop shortcut for it) and with NM28 exited.

Why msfn no potrable paf exe browsers? Unpacking is just the beginning. I install a lot of portable programs. In the case of the mypal installer, which launches the application / extraction to created applications, it also adds items to regedit and firewall I also use portable paf programs. Example: https://sourceforge.net/projects/portableapps/files/Mozilla Firefox%2C P.E. Legacy/Mozilla Firefox%2C Portable Edition Legacy52 52.9.0/ It is a convenient and installed / extracted browser based on the firewall approval operation.

Thanks for trying a new profile and confirming that it doesn't help. I don't think it's a matter of you and @kitaro1 being ignored, so much as the fact that no one here has a solution to the problem. I haven't tested it, but I strongly suspect "official" Pale Moon and Basilisk (on Win 7+) will have the same issue. I seriously doubt this is a bug that both @roytam1 and @feodor2 have both independently managed to introduce into their respective PM forks. So unless @looking4awayout's UOC patch helps, we're at the mercy of MCP to come up with a fix. Unfortunately the browsers (that @kitaro1 mentioned) that don't have this issue with GMail simply don't run on XP (or Vista), and can't be made XP-compatible. If that's the case, you know the drill: confirm the issue with official PM on a supported OS (Win 7 or later) and report it to MCP directly via PM's Help / Submit Feedback link. I agree; this has bitten me too when trying multiple versions of, say, Firefox, on the same PC. @VistaLover has the right answer - install at most one non-portable version of each browser - but it's easy to forget and not always practical. Luckily some combinations do work: Basilisk/Serpent 52, Serpent 55, PM/NM, BNavigator, Seamonkey, and FF all use different profile folders, so one of each of those can coexist peacefully without using "portable" versions. That's a bit much to ask of, say, 7-Zip; how's it supposed to know that what you're unzipping is a browser with this particular potential issue? But I'll look at adding a message of that sort to my "Download Latest Browser" batch file. AFAIK e10s/multiprocess only works on FF and Serpent, not NM; trying to enable it on NM just crashes it. But @roytam1 is customizing NM by locking some e10s-related preferences, so inadvertently installing the "wrong" UOC patch from @looking4awayout won't crash the browser.

@Kitaro1 I'm absolutely with you here. It's a real Killer-Trap that different browsers share the same profile, without any warning. Even advanced users need a LOT of experience to even consider such a possibility before trying a new browser. Even when fully aware it's a fork. Am just not sure how difficult it would be to change this behavior. Or if there's any chance that at least a new "parallel" profile is created? (Absolutely love being able to choose from parallel profiles at startup, a native Mozilla function since ages, no idea if still possible in 'modern' versions now) But IMO at the very least a confirmation/warning should pop up when installing/unzipping a new browser and it adopts an already existing profile. @3dreal: if not noticed yet, mobile facebook URL is "mobile.facebook.com" Some sites don't respect mobile URLs though and redirect to full desktop size, if the useragent is not a mobile string too. If you like a GUI to change UAs in KM, I recommand my useragents2018-macro ;-) It makes full use of the native engine functions, toggling only prefs, doing nothing else, and contrary to other macros allows to fake the global default UA too.

@VistaLover I have a similar problem with GMail freezing the whole browser whenever I close a tab with it open. Even reported it here but was ignored, and no, sadly creating a new profile doesn't help in this case.

Looks like I have somehow missed KB4519108 last month, though it's only a timezone update, so nothing special.

forget about that, Paul75. the chances of MS actually listening to you & others after opening a support case are slim to none when using Office 2010 on XP. and MS will be ending support for all Office 2010 editions next year on October 2020: https://docs.microsoft.com/en-us/deployoffice/office-2010-end-support-roadmap so I doubt MS will ever fix the Office 2010 MSO.DLL problems for XP/2003 as Office 2010 will be EOL in less than a year from now

Pay attention though, my friends, the UOC Patch is not compatible with Firefox Quantum (I just call it that way to distinguish it from the "Classic" Firefox) and I do not plan to port the Patch to that browser, ever.