Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Firefox process sometimes launches with one instance, and sometimes with many

  • 8 replies
  • 3 have this problem
  • 14 views
  • Last reply by guniu

guniu
guniu
more options

Why is that? I'm running quite heavy session on my Firefox (many tabs opened with Tab Groups addon) and it was always launching with 2 or 3 instances of firefox.exe (and that was good). But today, for no reason, nothing has changed, it launches with just one instance, and I can feel it. The whole browser is laggy and slow. I restarted it and it's still one instance. And it's not the first time it happened, few times in the past it did that. I don't know what's causing it to launch with only one instance. I can clearly feel the slow down that way. Can anyone explain this to me?

Why is that? I'm running quite heavy session on my Firefox (many tabs opened with Tab Groups addon) and it was always launching with 2 or 3 instances of firefox.exe (and that was good). But today, for no reason, nothing has changed, it launches with just one instance, and I can feel it. The whole browser is laggy and slow. I restarted it and it's still one instance. And it's not the first time it happened, few times in the past it did that. I don't know what's causing it to launch with only one instance. I can clearly feel the slow down that way. Can anyone explain this to me?

Chosen solution

ok, please see https://wiki.mozilla.org/Electrolysis/Accessibility

Read this answer in context 👍 2

All Replies (8)

philipp
philipp
  • Moderator
more options

hi, incompatible addons that you install can disable the multiprocess mode - the https://addons.mozilla.org/firefox/addon/add-on-compatibility-reporter/ makes them visible in the addons manager.

guniu
guniu Question owner
more options

I run firefox in safe mode, instead of installing another addon, and it still launched with one instance. Besides, as I said, nothing has changed, I didn't install any new addons, and non of the current ones updated, so everything is the same as yesterday.

philipp
philipp
  • Moderator
more options

what does about:support say about the state of multiprocess?

guniu
guniu Question owner
more options

I found two mentions of it (I have non english version of firefox). The first line from the picture says something like this: Multiprocess windows: 0/2 (disabled by availability tools)

And the other line says "true" in the "Enabled" column.

philipp
philipp
  • Moderator
more options

Chosen Solution

ok, please see https://wiki.mozilla.org/Electrolysis/Accessibility

guniu
guniu Question owner
more options

Ok, not much I understand from this. BUT:

Tools that can trigger disabling of electrolysis include:

  • Vision impaired related assistive clients (screen readers, magnifying glass clients)

Yesterday, by mistake, I launched the magnifying glass tool in Windows (I pressed Win key + NUMPAD+ by mistake), and closed it. So now you are telling me this disabled multiprocess in firefox for me? What can I do to enable it? Can I clear these two?

  • accessibility.lastLoadDate
  • accessibility.loadedInLastSession
philipp
philipp
  • Moderator
more options

yes, right-click and reset those two preferences and create a new integer preference called "accessibility.force_disabled" and set its value to "1".

guniu
guniu Question owner
more options

Ok, it worked. Thank you very much.