erpdude8

saw one of the comments from this reddit post: https://www.reddit.com/r/firefox/comments/1de7bu1/comment/l8gcjth/

Win10 21H2 was not entirely EOL (only the home & pro editions went EOL in mid-2023 but the enterprise & education editions of 21H2 will go EOL in mid-2024) guess that's why I like using LTSB/C releases (I run ltsc 2019 & ltsc 2021 which have much longer support)

24H2 got released in the release preview channel for windows insiders in late May https://blogs.windows.com/windows-insider/2024/05/22/releasing-windows-11-version-24h2-to-the-release-preview-channel/ also, OP has yet to tell us what kind of CPU/processor that person is using. SSE4.2 support was first added on the Nehalem series (1st gen Intel core) of Intel CPUs and also started with the AMD Bulldozer & Piledriver series of AMD CPUs (the FX series). any old Intel & AMD processors before these series do not have SSE4.2

are you running Win11 24H2 on a modern UEFI system or non-UEFI (legacy bios) system? modern UEFIs block unsigned drivers, especially on modern Intel based UEFI PCs with Intel PTT (platform trust technology) enabled

not worth it

so where's the video about this? btw, latest Firefox 125 version was 125.0.3, released on April 29 - a day after you made this post

well the only way to "fix" your problem is with "trial and error" methods such as either replacing the whole PSU as mentioned in the following threads: https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Hp-Compaq-Elite-8300-SFF-psu-graphics-upgrade/td-p/5743592 https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Power-Supply-Upgrade-for-a-HP-Compaq-Elite-8300-CMT/td-p/6928080 a youtube video link on how to replace the psu on the hp elite 8300 or replacing the entire motherboard https://forums.anandtech.com/threads/hp-compaq-elite-8300-small-form-factor-installing-new-board-processor.2580369/ and test again with the replacement components. sometimes, there's no easy way to tell but to use such trial-and-error methods

it's not just Google Chrome alone that will require CPUs with at least SSE3 Microsoft Edge is also following suit with the SSE3 requirement starting with Edge version 126 https://www.neowin.net/news/microsoft-is-ending-edge-support-on-computers-without-sse3/ https://learn.microsoft.com/en-us/deployedge/microsoft-edge-supported-operating-systems

Speaking of Chrome 120, official Google Chrome 120 stable just came out (build 120.0.6099.62/.63)

the 2015 ltsb version isos are still online after doing various google searches

looks like Windows 10 could have an ESU program similar to what occurred with Windows 7 a few years ago https://techcommunity.microsoft.com/t5/windows-it-pro-blog/plan-for-windows-10-eos-with-windows-11-windows-365-and-esu/ba-p/4000414 https://learn.microsoft.com/en-us/windows/whats-new/extended-security-updates

i wouldn't count on it now

eh maybe use either W10 LTSB 2016 v1607 or recent LTSC 2021 v21H2. LTSC 2019 was based on the buggy v1809 release (though recent CUs for LTSC 2019 make it nearly stable), which one other person in another forum deems that version "half baked" KB5031427 is the very last security only update for Server 2012 R0 / Windows 8 and KB5031407 is the equivalent security only & very last SO update for Server 2012 R2 / Windows 8.1. Microsoft is no longer producing any more new security-only updates for Windows Server 2012 / Windows 8.x beyond those two updates.

109.0.5414.165 x64 EXE (non-MSI) installer link

and need to be running a 64bit edition of vista and the HDD or SSD must be formatted with GPT partitions for UEFI booting

that's not the same thing as the REAL Windows 11 LTSC release which is coming late next year https://techcommunity.microsoft.com/t5/windows-it-pro-blog/windows-client-roadmap-update-april-2023/ba-p/3805227 time to close/lock this thread as there was a another thread asking about Win11 LTSC

an official (and REAL) Windows 11 LTSC was announced late April 2023 by Microsoft, which will come sometime in the 2nd half of 2024: https://techcommunity.microsoft.com/t5/windows-it-pro-blog/windows-client-roadmap-update-april-2023/ba-p/3805227

though Server 2012 R0 & R2 versions will get 3-year ESU extension from October 2023 to October 26 not just for Server 2012 R2 but also for rtm Server 2012 (or as I call it "R0") KB5028228 is the last rollup for 32bit Win8.1 and KB5028232 is the last rollup for 32bit Win8.0 gonna have to check whether or not KB5029295 rollup works on 64bit Win8.0

to install .NET 4.8 on Win8.0 and their .net 4.8 updates, look in this thread from another forum and here too (need to be a member there to view links) that is not the case as Mozilla recently decided to extend Win7/8.x support and the upcoming Firefox ESR 115 release WILL support those versions until late 2024. not necessarily true for 8.1 w/out the bypass tool it's not like with newer server 2012 rtm updates on win8.0; not quite the same as newer server 2012 r2 updates on win8.1 what has worked with win8.0 doesn't quite work the same with win8.1, Jody yup. fails with "we couldn't complete the updates undoing changes" error message part way. conducting my own tests with the Feb. 2023 & Mar. 2023 w8.1 embedded / server 2012 r2 updates, they fail to install on normal win8.1 editions including win8.1 core/home edition, thus agreeing with Jaguarek62's assessment. that's why that bypass tool is needed to fully install Feb. 2023 & newer updates for "client" Win8.1 edition OSes (bypass not needed for win8.1 embedded industry edition yet as that one gets support until July 2023) I know because I use a win8.1 core/home os on my father's old 2013 Toshiba satellite c55a laptop on a backup hard drive

it appears that these "new" Win7 ISO downloads have been pulled/removed by MS as I've recently got word from abbodi about them the links to them no longer work

https://bugzilla.mozilla.org/show_bug.cgi?id=1594270 saw this recent comment regarding Win7/8.x support for Firefox:

well some old versions of ms store are compatible with ltsb 2015 & 2016: https://github.com/kkkgo/LTSB-Add-MicrosoftStore it's just that newer versions of ms store will only work with ltsc 2019, ltsc 2021 & newer at least ltsb 2016 v1607 gets support until Oct. 2026

btw, windows server 2019 is based on version 1809 https://learn.microsoft.com/en-us/windows-server/get-started/windows-server-release-info and i'm using w10 ltsc 2019 which is also based on 1809

KB5022872 update just came out 2/14. check if this new update works (or not)

ok die hard win7 users start installing/testing the KB5022872 Feb. 14 update whether it works or not on Win7 editions other than Win7 embedded standard & Server 2008 R2