Firefox Community Forum

• • Background:**

I'm a senior software engineer running Firefox Developer Edition on a Linux machine with 8GB RAM. I have Fission architecture (site isolation) enabled, which I understand is now the default since Firefox 95+.

• • The problem:**

When I open 20 or more tabs across different domains, Firefox's memory consumption scales dramatically — often reaching 4–6GB of RAM for what should be lightweight browsing sessions. This is significantly higher than what I observed before Fission was enabled.

• • What I've already tried:**

- Disabled hardware acceleration → no significant improvement - Set browser.tabs.unloadOnLowMemory to true → partial relief

 but tabs reload constantly, disrupting workflow

- Reduced content.notify.interval → marginal improvement - Tested with all extensions disabled (safe mode) → RAM usage

 still high, confirming it's not extension-related

- Checked about:memory → large number of separate

 "Web Content" processes, one per origin as expected with Fission

• • What I'm trying to understand:**

1. Is there a way to set a maximum process count cap for Fission

  without fully disabling site isolation? I found 
  dom.ipc.processCount but changing it doesn't seem to affect 
  Fission's per-origin process spawning behavior.

2. Is browser.tabs.min-warm-process-count a relevant setting here

  and what is the safe range to modify it?

3. Does Firefox have a built-in memory pressure threshold where

  it automatically consolidates processes — similar to Chrome's 
  memory saver — and if so, which about:config keys control it?

• • Environment:**

- Firefox Developer Edition 151.0b10 - OS: Ubuntu 24.04 LTS - RAM: 8GB - Fission enabled: confirmed via about:support - Extensions: disabled for testing

Hi,

I've got Firefox with 4 adblockers: AdBlocker Ultimate, AdLock, Element Blocker and uBlock Origin. Still, https://www.youtube.com/c/franceinfo/live (news channel) sneaks ads before and after the weather forecasts. "C'était la météo avec Florette" (you watched the weather forecast with Florette salad sauce - of course I didn't!).

I can't find how to get rid of it. Please advise.

Not a question.

I needed to file a bug report so I went into settings to figure out what version I was on, only to be met with this useless view (see attached).

"About Firefox" contains no information whatsoever about Firefox. Who made this choice, and why? How is "let's show nothing at all on this page" a decision a product has made?

On https://support.startpage.com/hc/en-us/articles/4616565301524-What-is-the-Settings-URL it states, "You can save your Startpage preferences by clicking the Save your settings button at the bottom of the Settings page." I cannot find any such button anywhere in my Settings. I want to save "-youtube -facebook -spotify -instagram" to my search parameters. Thank you!

Hello, I use Firefox 150.0.1 on Linux Mint 22.3. I want to use the VPN integrated in Firefox but I don't see the VPN icon in the toolbar. How can I use the integrated VPN in this version of Firefox ? Thanks for your help.

When a site asks for my address, I try to choose one from the drop-down menu of addresses offered, but it firstly prints my address in the address window and then, when I press enter or do anything whatever, it deletes everything in the address window. Worse than that, if I try to ignore the dropdown list offered, and try to type in my own address, it deletes it.

This behaviour continues, no matter what I try to do do trick it into either (a) filling in my address, or (b) using the offered addresses in the drop-down menu. I.e. there is nothing I can do to ever get an address to stay in the address window and give me a fully filled out form - the address window always ends up empty.

I've tried to alter the settings, telling it to ignore the automatic filling in and remembering of addresses, but I can't turn this address-killer feature off.

Yes, it's made filling in forms on line impossible, since it keeps making the address-window empty

I logged into my account to try out the VPN. I get to the screen shown in the attached image. It wants me to "go to the open panel and turn it on." What is the open panel it refers to?

1- I am forced to abandon firefox browser on desktop 2- I wont quit using firefox until mozilla keep fighting against google's discrimination 3- I am forced to see no proper error message 4- No proper reason is told to wait and try later 5- This war wont end

I hate google more than any company in this world.

Now every (not just any random ) video when play for 10 seconds shows me same ugly annoying message

"Something went wrong. Refresh or try again later"

NO refresh works later after one day or even after removing all the history and saved site data. Even re install of latest firefox has no effect on google. Changing user agent is not working either. Tor browser is the only way to watch any youtube video. BIG, GREAT AND MANY THANKS TO TOR NETWORK.

Tor is left for the only way i can have a little freedom to watch youtube videos.

My pain point is that why i am forced to abandon firefox. I have been using it for decades. I love it. Its my best browser ever.,

Why chrome is the only browser to be allowed to watch videos on you tube.

Even safari when used there is always warning saying your browser will not be supported in future.

Google is creating same kind of problems in Android OS too.

My friends, Let me ask, what our future under google umbrella?

I strongly encourage you to raise voice for browsers other than chrome especially for firefox.

I use updates on linux and my firefox is always latest. There is no chance of any corruption or security risk with firefox on linux. Google intentionally forcing me to use chrome.

I want you to help me if have any clue what is going on.

I checked and borh of my Lenovo Chromebooks are running the 2026 version. Neither one will allow me to import bookkmarks . Is there a version I need other than the provided by Google?