In order to uninstall a possibly unwanted extension, please do the following:

1. Click the menu button and choose Add-ons and themes.
2. Once the Add-on Manager has opened in a new tab, click the Extensions button on the left side of the window.
3. You should now see a list of your installed extensions on the right side together with buttons on the right side of each extension.
4. To remove an extension from Firefox, click the ellipsis (3-dot) icon and click the Remove button. You should see a message that informs you about the successful removal of the add-on.
5. Note that some add-ons require a Firefox restart to be removed completely. To perform a Firefox restart after the add-on removal, click the Restart now link in the message.

You can find further information about uninstalling extensions in the following articles:

• Disable or remove Add-ons

• Remove a toolbar that has taken over your Firefox search or home page

Your Troubleshooting Information doesn't show "Total Adblock" as an installed extension, at least not in this profile. Do you only have one profile in case you sometimes start Firefox with another profile that has this extension?

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data