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I've just upgraded to V149 and, when using NordVPN, Firefox is now taking at least 30secs to startup. If NordVPN is off startup is instant. Prior to V149, Firefox startup was instant, both with and without NordVPN.

On my Windows 11 IOT Enterprise LTSC system firefox does not entirely close. After I installed my professional tax software from Drake Software LLC the following happens repeatedly: I open Firefox, look at a page, close Firefox, the screen clears and when I try to REOPEN firefox a popup says that it is still running and offers close or cancel. Neither button opens,closes or cancels Firefox. I have to reboot to make Firefox (147.02 64bit) close. This happens every time I open Firefox.

I recently got a new laptop with Windows 11 Pro. I installed Firefox from the Mozilla site. When I click to open Firefox, it takes a long time - 41 seconds to be exact. I uninstalled, reinstalled and restarted my computer. I cleared the cache. I tried to run as administrator. Not sure what else to try. As I wait for it to open, it reads "not responding" in the search bar area. Any ideas?

When browsing on Google Images, any time I swipe from one picture to the next, it is like the image doesn't want to swipe and is actively fighting against me. It is glitchy, bouncing around before I can drag it across my screen.

This is an issue of mobile FireFox, not of my device. Swiping and scrolling on other web browsers, such as Samsung Internet or Google Chrome, is seamless and buttery smooth.

I recently (within the last month) gotten an update in windows 11 and all of a sudden firefox slows way down and eventually stops doing anything...Any ideas what I can do to get firefox to actually work all the time??? I am using firefox 149.0 and it says it is up to date...

Have used Firefox for years, always do current updates. Still using Win10. After browsing for a few minutes, hard drive activity increases and the mouse and keyboard become unresponsive, returning very briefly for a second or two, before once again being unresponsive. After 10 min. or so, system returns to normal. This only happens while using Firefox. MS Edge, with all the same extensions, has no problem. Have searched many times, but no useful help is found. Have already un-checked hardware acceleration, and cleared caches, Am ready to give up and switch to Edge. Any help?

Firefox149开始，网页看抖音，每滑到下一条就卡顿2，3秒，换回148及之前的版本就没这问题 Starting from Firefox 149, when watching Tiktok videos on the web, there is a lag of 2-3 seconds every time I swipe to the next item. Switching back to versions 148 and earlier does not have this issue， https://www.douyin.com/

everytime I try to get to my sites its very slow and it says mozilla firefox not responding If I wait for a while it will finally allow me to get to my site but it takes a long time

My firefox broswer is starting super slow since the last update. I am on a windows 10 lap top running McAfee anti virus software.

In my task manager there are multiple firefox icons running. See the attached screen shots.

I copied one of the crash report into the note section below.

If any one know show to correct this slow start up pleas let me know.

Thank you Dale

2026Feb24

Dear Mozilla,

I use Firefox as my primary web browser.

I am constantly having to Force Quit Firefox in order to free up storage.

Please work on making Firefox handle storage better.

Bookmarks folder still takes too long to open when adding and editing bookmarks. When is this going to get fixed? Or where can i download an old version of Firefox for Android that does not have this issue?

I have a problem with 'efficiency mode' in Windows 11. Windows 11 forcefully puts many of Firefox's tasks into efficiency mode marked by green leaves within task manager in processes tab. It doesn't seem to do this to anything else except Steam Client WebHelper. My Laptop is always in max performance mode in all possible settings as it is always plugged in (this does not influence efficiency mode). It slows down performance making things take longer to load and might even break them. If you try to enable efficiency mode on a task it even warns you of this: 'Efficiency mode will lower process priority and improve power efficiency but may cause instability for certain processes. Do you want to continue?' There is no way to permanently disable it. Currently out of 19 tasks 8 are in efficiency after I woke up my laptop from sleep (I have 5 tabs open). Only way to stop it is to manually disable each one by one (right click on each task and disable efficiency mode). But Windows 11 will turn them back on automatically usually within a few seconds (it seems to depend on opening new tabs, reloading them or waking up the PC from sleep mode). From looking it up online there seems to be a way to disable it in browser on Edge and Chrome but that might be something else (I do not use the so I'm not sure). There was a solution for Chrome but it doesn't work on Firefox.

Is there any way this can be disabled permanently through Firefox or Windows 11?

I am not sure if you have herd this or not since the newest Firefox update everything is very slow. takes forever to get anything on Firefox especially with extensions enabled. Especially Facebook . Now i am not sure if this is Facebook's fault or if it is Firefox Iam using this version149.0 64 bit. if it is not Firefox have you hear d or seen yourselves about Facebook not loading correctly . Please if anyone knows of either problem feel free to contact me

There is a bug which was reported 3 month ago https://bugzilla.mozilla.org/show_bug.cgi?id=1959157. It appeared out of nowhere and I don't even know if it was fixed since then. But it is bugging me a lot, no pun intended. Any help would be appreciated.

The browser is very slow when opening a new tab... When I've opened Youtube it says that the Page is slowing down the browser and it takes a very long time to respond... I'm using MacOs Monterey 12.7.6 and I believe my Firefox is up to date

Since I installed Firefox, every software program, webpage, document, email and new tab freezes for up to five minutes. I can't get anything done. Please help! I tried the suggested steps but nothing works. I am not happy with Firefox at all.

Firefox is not responding. Also various apps are not showing/responding. Apps I use every day have disappeared and when I go into the App Store and search for them they are not even listed.