3 ways to reset Firefox

3 ways to reset Firefox
3 ways to reset Firefox

Most Firefox problems and bugs are caused by extensions or changes to settings. Resetting Firefox will fix most of these issues. You can restore missing information with a little extra work or by manually changing your favorite settings.


Method 1 of 3: Reset Firefox

Reset Firefox Step 1

Step 1. Visit the Firefox troubleshooting page

Open a new Firefox tab and enter about: support in the address bar. You will access a titled page Troubleshooting information.

  • You can also access this page by clicking on = (top right) →? (bottom right) → Troubleshooting information.
  • If that does not work, click on this link, then on 1st solution.
Reset Firefox Step 2

Step 2. Click on the Firefox reset button

Look for the Reset Firefox… button at the top right.

Reset Firefox Step 3

Step 3. Confirm

Click Reset Firefox again in the popup window, then click Finish in the second popup window. This will close and reopen Firefox, with the following changes:

  • all your extensions, themes and added search tools will be removed
  • all settings will be restored to their original state, including button locations and plug-in references
  • your download history will be cleared, so be sure to keep in mind the location of your downloaded files
Reset Firefox Step 4

Step 4. Delete your old data

Mozilla recommends that you delete the folder Old Firefox data from your office. If you want to restore some of your settings, read the instructions below first.

Method 2 of 3: Reset Firefox when it won't open

Reset Firefox Step 5

Step 1. Open Firefox in Safe Mode

This will allow you to reset Firefox, even if it doesn't open without crashing:

  • Windows: Hold down the ⇧ Shift key while opening Firefox. If that doesn't work, find the Mozilla Firefox (Safe Mode) icon on your computer.
  • Mac: Hold the ⌥ Option key while opening Firefox.
  • Linux: run / path / to / firefox / firefox -mode-secure from Terminal.
Reset Firefox Step 6

Step 2. Hold the same key while you choose a profile

If a list of profiles appears, hold the same key while clicking on your profile. This will only appear if you have more than one profile.

Reset Firefox Step 7

Step 3. Select Reset Firefox

Before the Firefox window appears, a popup with two elements will be displayed. Select Reset Firefox to reset your settings and remove all extensions. It is a permanent change.

Or either, select Start in Safe Mode to see if that fixes the problem for that session. If so, try disabling extensions and restarting Firefox normally. If not, start safe mode again and reset Firefox

Method 3 of 3: restore data after a reset

Reset Firefox Step 8

Step 1. Find the missing data

You can use this method to restore search tools, site specific settings, and download preferences, which usually don't cause bugs. Your saved passwords, favorites, browsing history and cookies would be automatically restored. If this data is missing, you can still recover it by following these instructions.

If you want to restore your extensions or settings, change them manually instead of using this method. Restoring them from backup will likely recreate your old bugs

Reset Firefox Step 9

Step 2. Open your troubleshooting page

Enter about: support in the address bar or click = →? → Troubleshooting information.

Reset Firefox Step 10

Step 3. Open your profile data

You will find the folder containing your profile data by clicking on the button at the top of the page. Look for the following words depending on your system and version of Firefox:.

  • Windows: show folder
  • Mac: show in Finder
  • Linux: open directory
  • Firefox 13 or earlier (any operating system): open the folder containing
Reset Firefox Step 11

Step 4. Find the old data

Your old data existing before the reset would be saved in a folder on your desktop. If you can't find it, search for the folder Old Firefox data on your computer.

On Windows, you may need to show hidden files

Reset Firefox Step 12

Step 5. Exit Firefox

You should always close Firefox before changing its profile settings.

Reset Firefox Step 13

Step 6. Copy the files to your current profile

Open Old Firefox data and choose a file you want to transfer (see below for how to identify them). Right click on the file and select Copy. Open the folder for your new profile. Right click on a blank space in the folder and select Paste.

  • On a Mac, hold down the Ctrl key and click on the file (right click)
  • When prompted, choose to replace or overwrite existing files.
Reset Firefox Step 14

Step 7. Choose the files to transfer

It is better to transfer few files, as one of them may be responsible for the bug. Here are some suggested files to transfer:

  • search.json: your search engine data
  • permissions.sqlite: preferences of sites that are allowed or blocked from cookies, installation of extensions, display of images or popup, etc.
  • MimeTypes.rdf: your preferences for saving a file or opening it with a specific program.
  • Firefox will try to automatically restore the items below. You don't need to restore them yourself, unless an error occurs during the reset.
  • places.sqlite: favorites and browsing history
  • key3.db and logins.json: saved passwords
  • formhistory.sqlite: self-filling online information forms

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