Firefox Quantum Clean Reinstall for improved performance on Mac OSX

This tutorial shows you how to do a *COMPLETE* reinstall of Firefox Quantum and assumes you only have one profile on the computer.

  1. Start Firefox and Download a new Firefox installer from http://firefox.com
  2. If you have Firefox sync enabled — go to Tools->Sync Now and go to step 4
  3. Go to Tools->Add On and make note of any extensions you want to restore when you’re done.
  4. Make a backup of your bookmarks (even if you have Firefox Sync)

    1. Click the Library icon Screen Shot 2017-11-18 at 11.25.57 AM
    2. Click on Bookmarks and at the bottom of the list click ‘Show All Bookmarks’
    3. Click on the Import Bookmark icon Screen Shot 2017-11-18 at 11.28.33 AM
    4. Click on Backup… and save your bookmarks
  5. Find the location of your profile directory
    1. Click on the “hamburger menu’ which looks like three lines in the upper right cornerScreen Shot 2017-11-18 at 11.18.22 AM
    2. Click on Help->Troubleshooting Information
    3. Click on ‘Show in Finder’ next to Profile Folder
      Screen Shot 2017-11-18 at 11.23.23 AM
    4. Right click on the Folder contents and click ‘Get Info’
      Screen Shot 2017-11-18 at 11.40.09 AM
    5. This will show you the location of the profile folder, which is usually ~/<username>/Library/Application Support/Firefox
      Screen Shot 2017-11-18 at 11.40.43 AM
  6. Quit Firefox
  7. IMPORTANT:  This step will delete all profiles from the machine.
    Find Firefox one directory above your profile directory and move the directory to the trash
    I tried just deleting only my active profile directory and this produced an error when starting Firefox.
  8. Find Firefox in the Application directory and move it to the trash
  9. Empty the trash
  10. Reinstall Firefox from the file you downloaded in step 1.
  11. If you have Firefox sync, login, do a Tools->Sync Now and you are done.
  12. If you don’t have Firefox sync,  Restore your backup bookmarks you made in Step 4.
    1. Click the Library icon Screen Shot 2017-11-18 at 11.25.57 AM
    2. Click on Bookmarks and at the bottom of the list click ‘Show All Bookmarks’
    3. Click on the Import Bookmark icon Screen Shot 2017-11-18 at 11.28.33 AM
    4. Click on Restore and recover your bookmarks
  13. Reinstall Add-on extension you want restored.
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