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https://github.com/mspaintmsi/superUser https://m2team.github.io/NSudo/

That's because FxESR 52 gets by default the (supported) Polymer v1 (Pm1) layout; only versions of Firefox older than 44 (Fx <=43) are being served the Classic layout, the one to be retired in March; if you use a UAO on FxESR 52 to spoof it as Fx 43, you'll get the older layout with the deprecation infobar: BTW, Firefox (Quantum) versions newer than 62 (63 =< Fx) are being served the newer Polymer v2 (Pm2) layout, which, on the outside, looks a lot like Pm1, but on the inside it's quite a different beast... FxESR 52 and the UXP browsers don't currently support it; of course FxESR 52 isn't maintained anymore, but MCP devs are already making talk about "upgrading" UXP to support Pm2 in the coming months; Google have not yet indicated for how long they'll keep supporting Pm1 Pm1 is considerably more resource hungry compared to the out-going Classic style, and this fact alone will create problems for older browsers capable of handling Pm1 but which are installed on old hardware (which seems to be the case with many XP/Vista users here... ) Of course, the forced migration to Pm1 will disable many user YT customisations, in the forms of XUL extensions, userstyles, userscripts etc., which were initially targeting the Classic layout; sadly, it'll be game over for those older browsers (on, perhaps, even older OSes/hardware) that can't cope with Pm1 at all... Some relevant links: https://support.google.com/youtube/thread/27596769 https://www.reddit.com/r/youtube/comments/eyjy4i/misc_fd_youtube_is_removing_the_old_design_soon/ https://forum.palemoon.org/viewtopic.php?f=3&t=23566 Chrome 49 has adequate support for Pm1, so if OP wants to continue using it for YT past March 2020, OP must: Install the User Agent Switcher extension from GWS: https://chrome.google.com/webstore/detail/user-agent-switcher/kchfmpdcejfkipopnolndinkeoipnoia Set a "Permanent Spoof" for youtube.com domain (aka SSUAO) and pretend to be Firefox 60 (e.g. Mozilla/5.0 (Windows NT 6.3; rv:60.0) Gecko/20100101 Firefox/60.0); then, every time a YT URL is loaded, OP will get the supported Pm1 layout without any nags about an unsupported browser: However, that workaround will, sadly, come to an end when evil Google decide to remove Pm1, too (which can be anytime, I hazard a guess and predict some time towards the end of this year) .

@TechnoRelicyes : yes , my post count is low but have been using New Moon as my browser for some time now. ( always the latest version ) have read the thread on the PM board and then some ... just started testing older versions on xp out of curiosity to find where something in the browser changed. the logon screen displays correct in the latest version , only after logging in with bogus credentials the error appears. maybe the page is at fault as suggested on the PM board or a change with the november 10 , 2018 build. the posted links are old versions of New Moon , not the Pale Moon browser. whatever , as i said , just curious. @roytam : thanks for having a look. your work on this browser is amazing. if you or anyone can not confirm my above findings i will leave it at that. regards.

alright problem found, fixed and archives updated.

Yes, the Tycho (platform) codebase was forked off Mozilla ESR 38 but (official) PM27, IIRC, comes with a native SSUAO for youtube; I don't have it handy ATM, but I believe it is advertising itself as Fx 42 to YT; low enough to make YT nag about it... I am delighted to report that YB 17.6.0.1633 (built on Chromium 58.0.3029.1633) gets served, as of this writing, the most recent YT iteration, i.e. Material Design with Polymer version 2 layout: (if you place the cursor on a video thumbnail, you get a video preview) Thus, I expect YB to work on YT for the foreseeable future; BTW, I composed this post using that very browser, so expect details of our exchange to reach President Putin's ears... (joking, of course... ) Best regards

Remember good ol' Windows 95/NT search? It just works!

Thanks for letting me know -- not sure how that one ended up available for download, as it was work in progress.