I-Firefox Community Forum

I have a HUGE problem with Firefox memory usage. Some open instances of firefox are taking anywhere from 600mb to 2.8gb of memory. Since firefox opens MANY instances even with only ONE active window, this very quickly uses all available memory (4gb) causing a full laptop crash.

More concerning is that CLOSING the worst instance of memory usage STILL leaves the single open page/tab open, so what exactly was the memory eating instance actually doing ???

I have included a screengrab of the many remaining instances of firefox in windows task manager AFTER closing the main culprit.

I have also included a screengrab of all the adblockers I use which I believed would limit unnecessary memory usage, but does not seem to be effective.

Many Thanks

Hello, I am running win 7. Yes and Old computer. When the system is running slow I do a task manager to see what might be causing it.

I have noticed multiple Firefox processes running with 0 CPU usage. What are all those for and do I need them? Can I disable them?

On a separate issue I am getting this rendering error. This may be a Microsoft question, but I thought I'd ask. Error in rendering player Error Code: 400-404 Session Id: k6x4392p (Pls: 35a725dd-3aac-4813-8431-159ebc196c01)

Lastly I did contact support about uninstalling two Firefox programs. I deleted the one you said.

Thanks again for all the help, Irv

I've been using Firefox on my Windows tablet (Win10) for years. After I installed version 138.0, my On Screen Keyboard (OSK) keeps popping up. Very Annoying! The OSK pops up every time I change tabs, or click a control like a drop down menu or check box on a web page or in the Firefox UI. Seems like the Firefox developers may be working on this problem because in version 138.0 clicking on a text input box did NOT bring up the OSK, but in version 138.0.1 clicking on a text input box does bring up a the OSK, but clicking other controls and switching tabs still brings up the OSK. Other applications on my tablet only bring up the OSK when I click a text input field.

Under about:config I tried setting ui.osk.enabled = false. That does not help. Seems that another OSK preference was non-default, but I changed it back to default, not sure which one.

Help would be much appreciated.

Even though CPU and GPU utilization is very low during 8K60fps Youtube playback in the Firefox browser on my base M4 Mac mini, the struggles heavily to play this, drops tons of frames, and the video almost stops playing.

8K 30 fps is not problem, and since utilization is pretty low, that doesn't explain the poor performance.

So please optimize 8K60fps Youtube playback on all platforms in the safari browser, but especially on Apple SIlicon Macs.

I'm a webmaster looking after a few websites. I recently installed Firefox Developer to do my website work on, mostly so I could shut down regular FF when FB calls my name too persistently. haha

I discovered yesterday when working on a client's site that FF Dev and FF Regular render some CSS differently. I have CSS that will thicken a border line around an image when you hover over it. It's done using a combination of padding-width and border-width.

In FF Dev it's fine and in other browsers it's also fine (Edge, Chrome), but in FF Reg it jumps. I've tried fiddling with the CSS but if I get it so that it works in FF Reg, it's messed up and jumpy in FF Dev. So it seems the two FFs render CSS differently, which seems very odd. Wouldn't they use the same rendering engine?

Is there a way to get around this? It's really frustrating because most visitors will be using FF Reg if they use FF at all.

You can see the effect when you hover over the intro images in the Featured and Suggested Article sections on the Home page of my client's site.

Many thanks in advance for the help.

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

https://www.yodesitv.cc/taarak-mehta-ka-ooltah-chashmah-30th-april-2025-watch-online/ links are not workingsince last 3 days or so can you modify this matter or your browser is prob?

Firefox is not loading on my desktop full sceen. I can see a small page minimalized when I put my curser on the Firefox icon. This has happened once before and I had to uninstall and install and I lost a lot of settings doing that. Please advise. Picture on the left is what I see, not the other. Rob Longmire grlongmire@gmail.com

I have my Windows Task Bar set to collapse when the mouse is not over it. When I first open the Firefox browser, I cannot get my Windows Task Bar to pop up when I hover my mouse over the bottom of the screen.

If I reduce the size of the Firefox window and then expand it back to full size the Task Bar will again operate normally by popping up when I hover the mouse over the bottom of the screen and then collapsing again when I move away.

This didn't start happening until after the last couple of updates.

Firefox has stopped obeying target="_blank"

Started a month or so ago.

Take a look at Firefox target="_blank" problem for details.

There is not a topic in the dropdown list that remotely addresses this issue so I just selected Performance and Connectivity for the hell of it.

Hello, a locally hosted application has a web interface which tries to send a data (POST request) to a remote resource (which is under my control) yet the web browser (Firefox ESR 128.9.0esr) blocks this resource request saying in a developer console (F12) this:

• NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_SECURITY, MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT)

• Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://myRemoteServerIP/request.php. (Reason: CORS request did not succeed). Status code: (null).

I suspect that the CORS blocking is a result of the first (SSL) error, AI also told me that I can configure my remote server/resource (e.g., using Apache, Nginx, or PHP) to include the necessary CORS headers in its responses and indeed the remote server of mine has such lines inside a PHP script that is receiving the request: header('Access-Control-Allow-Origin: *'); header('Access-Control-Allow-Methods: POST'); header('Access-Control-Allow-Headers: *');

The remote resource (server) is using self-signed SSL certificate and it is referenced using IP instead of a domain name.

When I try to do the same request via Private browsing window (without extensions), there is no NS_ERROR about self-signed cert. but only CORS one. When I try browser Librewolf 137.0.2-1 (my FF version is older: 128.9.0), the request is NOT blocked, is OK..

My main aim is not to avoid blocking in my browser, but in all main browsers for everyone.

Is it so that this kind of blocking is default behavior in browsers? Is there please any way to avoid that, beside getting a domain name and CA signed SSL certificate?

Hi I try to enter www.picturethisai.com web site to find an informations about some potted plant and I can see informations about this plant. Please help me. Jarosław Gawriołek

Hello, I can’t scroll anymore when enabling the performance settings ([https://support.mozilla.org/en-US/kb/.../performance-settings] ).

Is this a known bug? Is there any fix?

Thanks!