Firefox Community Forum

Your current build of firefox runs substantially worse for me than previous versions. I use Firefox because it is non-chromium, which typically offers more user freedom and control, but these new performance settings which cannot be edited individually, but are controlled automatically, are overstepping. Please advise how I can change the settings on a deeper level than simply switching off hardware acceleration. I'd like to limit multiprocessing primarily, but I would also like to have access to other performance settings. Further, I would like to have more control over how Firefox can access my devices. Please advise how I can access and edit the full list of permissions available to Firefox. I ask for this in the interest of transparency and personal data protection.

Firefox 157.0 is displaying some websites incorrectly. Newsmax pages turn white and McMaster-Carr is also displaying incorrectly such that I cannot make an order even if logged it. The same sites work correctly in Edge which I have an intense dislike for. I have already restarted Firefox and rebooted Windows. This started after the Firefox 157 update.

And it is rather annoying that the report does not tell me which addon is misbehaving either. I do know it runs just fine without any addons enabled so hence, the problem lies with a buggy addon and I'm left in the dark about which one.

I contacted C5 asking why I couldn't get subtitles while watching their streaming or on-demand programmes. They said, after asking about my laptop, that subtitles on the website via Firefox aren't currently available. Why is this and is there a way around it? They did say that dependent on which programme, the subtitles will likely be available on the 5 Stream app, but I don't watch on the mobile phone.

Not onlu amazon search is gone there are other search engines that I do not want. they were added but not by me! What's going on here? You're taking up my time undoing your messes.

After updating from Firefox 154 to 155.0 on Windows 11, the download progress indicator on the Windows taskbar icon no longer appears at all.

What I see: - While a download is in progress, only the circular progress on the in-window Downloads button is visible. - There is no progress bar/fill on the Firefox taskbar icon, even when the window is focused and the Downloads panel is open. - In Firefox 154 this taskbar progress worked. - Chrome on the same PC still shows download progress on the taskbar correctly.

I checked about:config for anything related to taskbar/download progress and found nothing that controls this.

Is the Windows taskbar download progress still expected to work in Firefox 155, or was it removed/changed? Has anyone else noticed this?

Thanks.

Hello,

I have the following error message......."The Application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sestrace.exe tool for more detail?

This error message pops up when I click on the Firefox icon. How do I correct this error message?

Thank you.

Well I am continuing and repeating my question placed in August 2026, where I found that Firefox V154.x stalled in an erratic way that made it completely impossible to use it or to send a crash report. So your suggestion to send a crash report was not very bright or helpful. I deliberately omitted the subsequent updates, to try again after a main version update. Alas, we have the same situation again in V157.0, this time more predictible. The program stalls immediately after trying to open another tab. And again, you can kill the program only by task manager.

The additional question I have, is how to switch off the annoying update message, as long as Firefox is dysfunctional after an update, I'd like to avoid any update under all circumstances. I have to work with Firefox, so it is more than an leisure thing for me, I cannot afford to cripple Firefox by an unintended update.

I had to reinstall the last known working version (153.03) to send this message.

I just upgraded Firefox to version 156.0.2.

It no longer plays mp4 content from a website. It says "No video with supported format and mime type found".

This used to be OK.

This just started on October 4, 2026, my home page normally has great news and other articles but now the page seems to be in a constant loading mode. Nothing is displayed.

When i updated my browser today it showed me a page which said that VPN can be used by clicking on the VPN button in toolbar so i tried to do it but it is not showing in my browser and also it is showing nothing related to VPN in settings.

I’m still unable to access Newsmax articles in Firefox. I am getting this error:

“You don't have permission to access this resource on this server.”

Reference #18.d756268.1791195720.16bc0e errors.edgesuite.net

The important detail is that Newsmax works normally in Microsoft Edge on the same computer and the same internet connection, so this does not appear to be an IP or general connectivity problem. The problem appears to be specific to Firefox.

I contacted support yesterday but did not receive a response. Could you please have your technical team look into the Akamai/Firefox access denial associated with the reference number above?