Firefox Community Forum

Issue remains - see post [https://support.mozilla.org/en-US/que.../1525355]

Is there a way to backup a profile?

Windows 10, latest version.

I hit a shortcut, I think, and heard the trackpad, then one of the three open tabs was isolated from the rest in a separate, almost chromeless window.

It's not in the taskbar pop-ups but instead has its own icon. In this 'chromeless' window there is no option to add a tab or window, there is no area to move it (I have to carefully use emtpy space in between buttons to move it). The top just fell off, that's basically it.

I have never seen this and have been using Firefox from the start way back when. I didn't install anything; this just happened as I was reading something and accidentally touched a key. Nothing changed, no settings were adjusted, nothing.

This option is not in the tabs menu or anywhere. I must say I kinda like it for this one 'tab' (which is a solo chromeless window) but I do need the menu and so on for productivity.

One of the screenshots shows this 'window', the other shows that 'window' is not part of the regular pop-up tabs in the taskbar but rather has its own icon, as if it were an app, in that taskbar.

What in the world is this? Can someone help?

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?

Description: We have encountered a significant performance issue with NativeMessaging API in Firefox when an extension communicates with a native application.

In scenarios where many objects must be enumerated (e.g., ~458 certificates), Firefox is dozens of times slower than Chromium-based browsers.

Environment:

Firefox (latest stable, reproduced in 2025)

Windows 11 x64

Same machine and same native plugin tested in Chrome, Edge, Yandex Browser

Steps to Reproduce:

Create a WebExtension that communicates with a native application via NativeMessaging.

Perform enumeration of a large number of objects (≈ 450–500).

Measure execution time in Firefox vs Chromium.

Actual results:

Firefox: enumeration of 458 objects takes ~2 min 30 sec

Chromium/Edge/Yandex Browser: enumeration of the same 458 objects takes ~5 sec

Additional tests: Round-trip time (RTT) for a single message:

Firefox: ~73.7 ms

Chromium: ~0.3 ms

Because the extension and the plugin exchange a large number of messages, this performance gap becomes critical.

Expected results: NativeMessaging API in Firefox should perform at a level comparable to Chromium browsers, so that extensions relying on heavy message exchange remain usable.

References: Bug 1288912 – Native messaging performance is extremely poor

Although this bug is marked as resolved, performance testing still shows a major discrepancy in the current versions of Firefox.

Question: Is there any ongoing work or plan to optimize the implementation of NativeMessaging API in Firefox to address this performance issue?

The bookmarks on my taskbar are all of a sudden not showing up. I'm unable to drag them there like I used to. Also, the history and menu button on the upper right don't work now. I've restarted with no luck.

Mozilla sidebar has been replaced by "Choose an AI chatbot to use in the Firefox sidebar." How do I undo this and return to Mozilla standard Firefox sidebar. Not at all what I want to do. Help

Many web pages that have a video header will launch the video in a popup window after you scroll past the header.

There are no user controls in the popup window, and clicking 'block popups' and turning off 'enable p-n-p controls' had no effect on them.

Is there a a setting that will stop these video popups from automatically launching? They eat up a lot of memory, and are a pain to turn off manually.

Thanks.

I installed Firefox on a fresh Win 11 install, and most of the the favicons are still generic on the Home Page several days later. Facebook, Ebay and Youtube are the only ones that appear consistently, sometimes other will display, but then be gone again the next time the app is launched. All other links just have the generic letter icons.

I tried deleting the 3 favicon files in the Profiles folder, but it did nothing. I've tried manually re-adding the links, still nothing. I removed the "S" from "https;//" and still nothing. The favicons all show up on my other machines which use Firefox on the same user account, so it is not a problem with the websites themselves.

Not sure if its related, but upon installing Firefox on this machine, it made Firefox on my Mac desktop absolutely freak out. I had to make a significant number of changes over the course of hours to fix everything, so many relating to favicons alone that I don't know what actually fixed it.

What else can I do to try and get these working? Why does Firefox apparently struggle with this particular feature across multiple OSes?

Thanks.

suddenly today the mic has stopped working in Chat GPT. I have changed nothing... checked all settings, everything is ok... why does it suddenly say "Enable Mic Access to Dictate"?

Where are my bookmarks? Everything is gone with the update, and you didn't warn this could happen. Is there a way to recover the bookmark file? Profiles does not help for there is no new profile there. I NEED THE BOOKMARKS FOR WORK!!!

Im using Windows 10 Pro 64 bit on a Asus laptop with 32GB RAM in it and a i9-9980HK @ 2.40GHz. It has a GeForce RTX 2060 graphics card in it with 6GB memory. I use it for work and need to have multiple tabs open at a time as a result. I always have at least 4 tabs and can sometimes get up to around 10. I also have Zoom running as well.

I keep seeing a ton of Firefox processes open when I look at Task Manager. Attached is a screenshot I just took with 7 tabs open. It shows 34 processes in the first clump with more open outside of that one.

I unchecked Use recommended performance settings and checked Use hardware acceleration when available but all that did is lower the amount of RAM being used by 100MB. I have 2 extensions enabled in Firefox, AdBlocker for YouTube and AdBlocker Ultimate. They have never been a problem before. This lag and massive overusage of RAM has only started in the last couple of weeks.

Anyone know why this is happening or how to reduce how much RAM Firefox is using? I like this browser and would have to have to switch to another one. Thanks in advance.

So I just noticed an odd thing today. In the URL bar there is a new icon listed as 'add to taskbar' and 'toggle reader view'. The former interests me more than the latter. I get the idea behind it, but it's not really for me. Is there a way to remove these from the URL bar? I looked in settings, but didn't see anything. So if it's not there, I'm guessing it needs to be fixed in about:config? If so, where do i look for these?

I'm including a screenshot of the icon in question.

Tabs are not restoring after session closed. I have tried the profile suggestion. I verified my settings say open tabs from last session. Rebooted. Cleared cache then opened tabs then closed and it keeps only opening one tab. It crashed last night with tabs on it and this was the results once I brought it back up.

How to stop firefox from prompting me with this pop up (see attachment). I already removed the whatsapp app from firefox, it's still not working as it used to be which is to start whatsapp conversation directly in the web. It's annoying because the app is so easy to install but hard to remove. Firefox should do something about this.

For a week my pinned tabs are lost every time I open Firefox. I have checked my settings, they were the same as always. I have de-selected them, closed and re-opened firefox, selected them again, closed and re-opened again, pinned my tabs again. Then closed and re-opened firefox and still they are not there. I have done this multiple time with the same results. This seems to have started after the last update.