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This morning firefox told me it needed to upgrade an addon (noflash) and I told it to go ahead. Now Firefox won't start.

  1. How can I prevent Firefox from loading the addons?
  2. Where are the Firefox config files?
  3. How to I start Firefox.app from the terminal, so I can pass a parameter?

UPDATE I was able to start Firefox in safe mode by holding down the 'alt' key while clicking on the dock icon. (see my answer below)

so problem 1 (the main problem) is solved .. can anyone help me on 2 and 3?

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  • I have updated my answer for your 3rd question
    – Mark
    Mar 18, 2010 at 12:01

4 Answers 4

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Hold down the option key, as you start Firefox.

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If by config files you mean your profile it is located in your user home directory under the following path (xxxxxxxx is a random string)

~/Library/Application Support/Firefox/Profiles/xxxxxxxx.default/. 

To start firefox from the terminal do the following (see here for a reference)

/Applications/Firefox.app/Contents/MacOS/firefox
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I clicked the firefox icon in the dock while holding down the 'alt' button. Firefox came up in safe mode and presented me with a dialog where I could disable all addons ..

I now have all addons except noflash (uninstalled) working again and am editing this text using Firefox.

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On a Mac, you should have "locate" installed (I did on my mac, which I had a few years ago ...) so if you can open a terminal (usually in Applications/Utilities/terminal) you can just say "locate firefox.app" (or even "locate firefox") and it'll find it. Barring that, you can also do:

sudo find / -name "firefox.app"

"find" definitely exists on OSX.

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  • I'll look for 'locate' or I could write a shell script using sudo find / -iname "firefox.app" thanks for the tip (+1 for that)! BUT Alas, I already found 'Firefox.app', I need a way to run it from the command line
    – lexu
    Mar 21, 2010 at 12:27

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