I-Firefox Community Forum

In Firefox, When H264 frames are decoded and rendered within a single tab, the output reaches up to 180 fps, performing well and meeting expectations. When decoding and rendering occur on two separate tabs on parallel, performance significantly drops, impacting both processes. However, it performs smoothly when running on a single tab.

In comparison to the Brave browser, H264 decoding and rendering are noticeably slower in Firefox. Firefox manages only around 180 fps, while Brave and other Chromium-based browsers can achieve approximately 1000 fps on a single tab and around 800 fps when multiple tabs are open.

Document Link : https://workdrive.zohoexternal.in/external/writer/999ecda6e3a0b1ed2d4629c8480a6c1d595764234c29563e5bc8aa530cfbc431

Hi, Since the last update for Mozilla on the laptop (updated on 6/Oct/2025 - version 143.0.4 (64-bit)), all the shortcuts to websites in Firefox homepage I had pinned have disappeared. Also I can't add new shortcuts. I already have shortcuts enabled in Settings>Home>Firefox Home Content>Shortcuts.

Does anyone know how to solve this?

Kind regards.

Bárbara O.

What does this mean? being updated by another instance

Is this why my FF is running godawful slow today?

Pages coming up in 20 to 60 seconds or more instead of in a second or two.

I switched to Firefox a few months ago and I've been using the "about:profiles" page to mimic chrome's profile feature. I have 3 profiles, each with their own Mozilla account. How can I migrate these to the new profiles system?

Hi,

I've recently removed Sidebery as a extension, as Firefox now offers a similar feature - I'm really happy for that. I'm using the sidebar with "Expand sidebar on hover" on three different computers, and notices it many times every day, that the sidebar doesn't expand when i hover my cursor over it. In that case, i usually press the sidebar button so it's expanded by default, waits a while and try again.

Sometimes i notice that it doesn't trigger when the firefox download section or history "pop-up" are open - it would be nice if it did, sometimes i need to move a downloaded file into a webpage on another tab, but can't remember what favicon - but that's not really the cause of this question.

Is there any way for me to debug the problem when it's bugging out? Or is it something known? I can't find any else complaining about it, but as said, it's on all three of my computers (Win11), which all of them have two different instances of Firefox (Normal Firefox and Dev Edition) which are all synced between computers, so all 6 browsers are "doing it", and i can't seem to find a pattern or a cause.

I have Firefox (always updated to the latest version) and I have noticed a memory leak that EATS up RAM. I have 1 tab open, playing a set spotify playlist. within 24 hours of rebooting the machine, Firefox has swallowed 7gb of my Memory as shown in Activity Monitor/Memory Pressure. I've been having this issue for some time, updates to MACos make no difference either. NO other program does this. I've tested the same playlist in other browsers, Chrome, Safari, uses 1gb, brave/opera uses less than 500mb and they've been open for over a week. This memory leak is a bug in Firefox. I've seen it before (other software, mainly on Windows) but never like this on a Mac......How do I escalate this?

Hi! I'm on a relatively new to me (refurb) desktop computer running Win 10 Pro (64 bit)* and Firefox 143.0.3.

In the past week both Firefox and Win 10 have updated. I don't know what happened, but now when I boot up or reboot, my computer opens to MS Edge. Yuck!

Every single time I have to reinstall Firefox! Once I do that, all is well again. I have all my bookmarks back, etc.

It also keeps changing my "default to Firefox" browser setting, turning it OFF, while I'm using Firefox. I repeatedly have to keep going in and clicking to make FF to the default browser again.

Why is it doing this? How do I stop it?

Anyway, I know I can't delete Edge or uninstall it. How do I shove it back into the black hole it has lived in until now?

Thanks very much in advance for any help offered. :)

KathyOnOBX

• (Nope - computer not eligible to upgrade to Win 11. My processor isn't fast enough, I think.)

Reporting a bug:

"Firefox can’t update your languages right now. Check that you are connected to the internet or try again." but - Connection is established, INDEED!

German language pack not available :( manually downloaded verisons of german Language pack are incompatible.

please fix.

when we open firefox, the language comes up in Germany, it whats to know if we want to translate to English but should come up in Englisg. we went into settings and made sure it was set to English

Hello! After a clean install of Windows 11 24h2 Pro, Mozilla Firefox is unusable. It takes about 2 minutes to load a page which is abnormal. I remember I had the same issue when I first installed Windows 11 23H2 Pro and that was resolved somehow but it was 2 or 3 years ago and I've no idea what the solution was back then. I've tried some basic stuff including Test suggestion which of course didn't resolve anything as almost all of them are referring to cleaning cache, reinstall Firefox etc and it literally has nothing to do with my situation. Any solutions?

When I view an item on Ebay this weekend, the images are not selectable (ie., an item that has 5 images will only show the 1st one in the main window, with no zoom or clickability). Firefox is my default browser, version is 143.0.1 (current), Windows 64-bit, and no ad-block extension is activated for that tab. Opened same pages/items in Bing, and images were accessible and selectable.

I keep getting a message when loggin into my gmail account to enable cookies. I'm using firefox so I assume that's where it want cookies enabled but I don't find a setting for it

I thought I was just upgrading my Mozilla/Firefox account account and now everything I had is gone. I had an automatic taskbar that went to most of my frequently used services like my bank, yahoo mail, etc. Now I have stupid stuff that I never use. Makes me want to switch to something else.