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After updating to v 133.0, when maximizing Firefox (not F11 fullscreen), a taskbar that is set to "auto-hide" will no longer unhide when mousing to the bottom of the screen. This did not occur with the previous version (132.0.2).

This behavior is also unaffected by the "devtools.toolbox.alwaysOnTop" setting in about:config as i've tried switching from the default "true" to "false".

Update: Still persists in 136.0.2

Every 2 to 3 weeks the Thunderbird Calendar gets wiped out, ie all entries deleted. Once it occurred right after an update. A few hours later it will reappear. Why does this happen and what's the remedy to stop this?

I was in the process of writing a somewhat lengthy response and went to another webpage or webpages and when I went back to the webpage where I was writing the somewhat lengthy response, the webpage was completely blank! The Back and Forward buttons were grayed out, Refreshing the webpage did nothing so there was NO way to get the webpage back. Interestingly, when I hover over the URL, at the end of the URL for the webpage, it had "about:blank." Things like this are very frustrating and waste a lot of my time.

In addition, another problem I reported on 3/20/25 (link is: A webpage I just closed recently is not listed Back arrow issue) has still no response.

Also another frustrating thing about the Firefox browser is that at times the Bookmarks sidebar disappears.

I need a reliable browser, not one that sort of works! I request that these issues be addressed soon.

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I'm new to using the Thunderbird email client but I find the UI very sluggish and almost unusable compared to Outlook email for MAC.

Running on mac osx 12.7.6. Anything I can try to speed things up.

4 days ago, the calendar app suddenly stopped working. If I try to add an event, it sends an error message saying 'An error occurred when writing to the calendar Sandra Kanfer Clarke! Please see below for more information.' and tells me 'modification_failed' and that 'If you're seeing this message after snoozing or dismissing a reminder and this is for a calendar you do not want to add or edit events for, you can mark this calendar as read-only to avoid such experience in future. To do so, get to the calendar properties by right-clicking on this calendar in the list in the calendar or task view.' At this point, the calendar switches itself to 'read only' and I get the exclamation mark and triangle saying this calendar is momentarily not available. This is a synced Google Calendar that has been running on Thunderbird for several years without any problems. I uninstalled the calendar and reinstalled it, I uninstalled Thunderbird and reinstalled it - none of it makes any difference.

I have a new macbook air running Sequoia 15.3.2, firefox is up to date, my battery which should technically last about 12 hours and I only get 5. Ran through everything with Apple and they said it is a Firefox issues. I don't have any extensions, add on etc. Thoughts?

For some weeks I have ad an issue with Firefox using 50%-100% of CPU. Normally it is the Firefox process itself, sometimes it is also "Privileged Cont".

OS is Kubuntu 24.04. Firefox has done this across 2-3 versions.

Things I have tried:

Restarting Firefox No change, I'll even get 100% cpu usage with no tabs open

Refresh Firefox to remove settings and addons No change

Uninstall Snap and try direct Apt package No change

Remove ~/.mozilla to fully remove any residual settings/cache/etc No change

Try with and without hardware acceleration See: https://support.mozilla.org/en-US/questions/1308215 No change!

I would blame my old computer hardware, but Brave runs fine. I am now using Brave, but would dearly like to return to Firefox as I miss containers, and I don't support a chromium dominated web.

Hello, I have an empty space on the toolbar between the "New Tab" button and the "Minimize Window" button in Firefox. Is there a way to remove or reduce this space to make better use of the available space? Any help would be appreciated! Thanks.

my Extension wallet (metamask) is not being open on this browser. this wallet was connected on "paericle network" tesnet project. i need to open my wallet. pleasse check it.

Hey everyone,

I’ve been using FL Studio on Android FL Studio on PC, and I noticed that when I have Firefox open, the performance seems to drop—especially when playing back complex projects. Sometimes, the audio crackles or lags when I switch between FL Studio and Firefox.

I’ve checked my system resources, and Firefox does seem to use a fair amount of RAM and CPU, but I’m wondering if there’s a specific setting in Firefox that could help reduce this issue. Has anyone else experienced this? Any tips for optimizing Firefox so it doesn’t interfere with FL Studio’s performance?

Would appreciate any advice! Thanks.

Since a couple of days I have the follwing 2 problems: 1. I can't update my google calendar from TB and changes made in the android doesn't show in TB 2. The message moving function doesn't work. Messages disappear from the inbox but wont show in the folders where they should have been moved to.

I have TB 128.8.1esr(32-bit)

After the latest Firefox update, Subtitles and closed captions not saving settings in latest Firefox in spite of resets, reboots, clearing cache. Appears to be on Windows 11 but is fine in Windows 10.

See the attached image. This showed up when viewing PDFs. The highlighter demo can not be removed or turned off. I uninstalled Firefox, reinstalled, still there. Uninstalled Acrobat, the demo is still there.

hello thank you all , i need your help to solve my probleme. i need to setup firefox remot debugging server on a localhost. but re remote debugging server of firefox is not working/establishing a connection, when i test local port 6000 after performing this command

"D:\Path\To\firefox.exe" -start-debugger-server 6000 -no-remote -safe-mode

or "D:\Path\To\firefox.exe" -start-debugger-server "configured port on about:confi i tested several ports like 9222,6000,7000,6080 and configured devtools.debugger.remote to True in about:config page of browser and dissabled the firewall and antimaleware of windows 10 , but still does not work. even i reinstalled the last version of desktop firefox from your website but still the remote debugging server does not stablish a connection o any port. i sure the problem is not from my system. can u help me , what should i do to stablish a local remote debugging server using desktop version of firefox? help me. i am really in problem . i have done that job using microsoft edge but i need to use firefox.