Latest update 115.43 ESU crashes consistently

alphaa10000 — Thu, 15 Oct 2026 20:19:19 GMT

Because of legacy software, I have been forced to run Firefox ESU in Windows 7 64bit.

Yesterday, when I updated to 115.43, in regular. non-incognito mode, Firefox crashed on every attempt to run the browser. By contrast, the previous version ran well in any mode.

Reversion to the previous version is not recommended, but if I am forced to revert, where do I download the previous version?

* I submit this post in 115.43, incognito mode

Re: Latest update 115.43 ESU crashes consistently

dftf — Fri, 16 Oct 2026 08:28:17 GMT

@alphaa10000 : not sure why the 115.43 update would suddenly cause an issue, giving they're only doing security-fixes there now, no new features that ever change much.

The fact you're able to open it successfully using Incognito (Private Window) mode, where all extensions are turned-off by-default, suggests an extension issue. Go to Menu -> Extensions and Themes -> click the ⚙ icon -> Check for updates. After that, try the normal mode again.

If it still crashes on launch, go back into Private mode, then Menu -> Extensions and Themes again and disable all your extensions except one. Then close the Private window, and open a normal one again. Repeat until you find which extension is causing your issue (i.e. find which one when on causes normal mode not to load up).

You can download the previous ESR 115.42 here:
https://ftp.mozilla.org/pub/firefox/releases/115.42.0esr/

Click "win64", then the language you want Firefox in, then download the file with ".exe" at the end.

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Latest update 115.43 ESU crashes consistently

Re: Latest update 115.43 ESU crashes consistently