This is very easy to follow.

At your Run prompt, type in firefox.exe –ProfileManager click OK to run this command.

You should see the profile editor screen.

Click on Create Profile to start creating a new profile, you will see the Create Profile Wizard.

Enter the name of this new profile. Clicking Finish will create the new profile.  you should see it appear on the list of profiles

Now you can try run Firefox, you should see a fresh Firefox with  no bookmarks and add-ons loaded with it.

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