We're sorry to hear that Firefox is crashing when you open it. Please do the following to give us crash IDs that will help us understand more about the crash.

1. Click the Finder icon in the dock. On the menu bar, click the Go menu, hold down the option or alt key and select Library. A window will open containing your Library folder. Then open the "Application Support" folder, the "Firefox" folder, the "Crash Reports" folder and finally the "submitted" folder.
2. Open the 5 most recent files with a text editor and copy the IDs.
3. Paste each ID with bp- into the reply window on the forums.

Thanks in advance!

You can find more information and troubleshooting steps in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

You have a weird user agent listed in the System Details list.

• User Agent: Safari

Did you enter this information yourself or is there a real problem with the user agent?

If there is a problem with updating or with the permissions then best is to download the full version and trash the currently installed Firefox application to do a clean reinstall.

Download a new copy of the Firefox application and save the Disk Image file to the desktop Firefox 63.0:

• https://www.mozilla.org/en-US/firefox/all/

• trash the currently installed Firefox application (open the Applications folder in the Finder and drag the Firefox application to the Trash) to do a clean reinstall
• install the new version that you have downloaded
• https://support.mozilla.org/en-US/kb/Installing+Firefox+on+Mac

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you reinstall or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.

philipp said

1. Paste each ID with bp- into the reply window on the forums.

Here they are: bp-5a9d6133-01f3-4e8c-91f9-5c1db0181027 bp-5ac30f03-dc52-4d4d-80f4-ba2220181027

thank you

Nicola

See:

• /questions/1238157 Firefox crashes because of the fbplugin plugin

cor-el said

You have a weird user agent listed in the System Details list.

• User Agent: Safari

Did you enter this information yourself or is there a real problem with the user agent?

---

If there is a problem with updating or with the permissions then best is to download the full version and trash the currently installed Firefox application to do a clean reinstall.

Hi, I don't know what a "user agent" is. Concerning the "clean reinstall", I followed (again) your instructions (thanks) but I get the same error, which you can see below (in italian)

The crash report shows a problem with fbplugin as mentioned in this thread.

• [/questions/1238157] Firefox crashes because of the fbplugin plugin

cor-el said

See:

• /questions/1238157 Firefox crashes because of the fbplugin plugin

IT - COULD - WORK !!!

Thank you so much

Nicola