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Multiple firefox.exe in background processes crashing browser

  • 8 replies
  • 2 have this problem
  • Last reply by FredMcD

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After a recent automatic update my old problem with Firefox Quantum came back. Every time I open Firefox browser I get multiple 4-6 firefox.exe running in the background processes. When I go into details and try to end process tree it crashes my browser. When I open Firefox it starts all over again. I have gone into about:preferences and

   De-select ‘Use recommended performance settings’
   Set Content process limit value to ‘1’ from its default value

I have also gone into about:config and switched browser.tabs.remote.autostart to false. Still have the same problem.

All Replies (8)

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Hi activecarbon, 4-6 processes running for Firefox is normal. Crashing is not. Have you submitted any Crash Reports? See this article: Firefox keeps crashing at startup to help resolve the crashes.

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How come my firefox browser crashes when I close out the firefox.exe processes in the background of my task manager?

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Hi, Those are the processes that Firefox needs to run. When you 'End Task' you are "killing" the browser.

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In the address bar, type about:crashes<enter>.

Note: If any reports do not have BP in front of the numbers/letters, click it to submit them.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most resent 7 - 10 Submitted crash reports, and copy them. Now go to the reply box and paste them in.


For more help on crash reports, see; +++++++++++++++++++++++ If you can't get Firefox to open, you will have to do this the hard way. Open the file browser/explorer on your computer. Note: You may have to enable Show Hidden Folders / Files. Enter this in the address bar;

Windows: %APPDATA%\Mozilla\Firefox\Crash Reports\submitted Win 7/Vista: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Crash Reports\submitted Win XP/2000: C:\Documents and Settings\<username>\Application Data\Mozilla\Firefox\Crash Reports\submitted

Mac OS: /Users/<username>/Library/Application Support/Firefox/Crash Reports/submitted Linux: /home/<username>/.mozilla/firefox/Crash Reports/submitted

The crash report is several pages of data. We need the report numbers to see the whole report.

Copy the most recent 5-7 File Names in the folder. Post the information in the reply box.

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@FredMcD, It looks like they are crashing it in Task Manager

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activecarbon, To help clarify for you, the processes are all named firefox.exe because they are relevant to operations within the browser. Your extensions, plug-ins, tabs, etc. all require a separate process to run.

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I couldn't change the original question - Firefox doesn't crash unless I "end process" in Task Manager....but it is using huge amounts of both memory and disk space. I know this is for Firefox, but the same thing is happening in Chrome. I changed the browsers.tabs.remote.autostart to false, checked about:support, and multiprocess/windows did change from 3/3 to 1/1 and says Enabled by default. If I understood the instructions correctly, the first number should have "reset" to 0?

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danetteh2010 Please go to the top of any web page and use the Get Community Support link:

Select the product for what the problem is (Firefox or whatever). Now select the category for the problem. At the bottom is Other.

Describe the problem in brief (one line). Then press <enter>. The website will display any prior posts that might help you. If nothing on the list can help, at the bottom press the button; None Of These Solve My Problem.

Now enter all the relative information on the problem. At the bottom of this, you can Add Images.

Under this is Troubleshooting Information. Please press the Share Data button. This will let us look at your system details. No Personal Information Is Collected.