To remove SellerTab from your Firefox browser follow these steps:
1. Click on the "Options" icon at the top of your browser and click on Add-ons.

2. Under "Add-ons" click on remove enar your SellerTab add-on.

3. Next, go back to "Options" and click on "New Private Window".

4. In the new sindow enter in the URL window this path "about:config" and click on enter.

5. Open a search by clicking on Ctrl+F, in the search window enter this pharse "browser.newtab.url".

6. Click on "browser.newtab.url", remove the "www.sellertab" URL and click on "ok".

7. Now SellerTab will no longer show in your Firefox browser.