How can / do I compeletely uninstall/remove the unwanted "Web Developer Extension" that was automatically installed on my computer without permission, when I reset Firefox in safe mode?

Reset Firefox in safe mode. Click 'Help', then 'restart with modules disabled.

After the reboot, Checked 'reset all the preferences of Firefox by default'

Once completed, found three new tabs, one asking if I wanted to continue the previous session, a second Firefox, by saying: "Welcome to Firefox".

And a third with the title, "Web Developer installed"

By clicking on the tab took me to: http://chrispederick.com/work/web-developer/installed/11/ saying "the Extension Web Developer has been successfully installed."

The new Web site, which also requested donations, seems not related to Firefox. Anyway, nobody has ASKED MY PERMISSION to install

AM CONCERNED ABOUT THE EXTENSION NOT DESIREE AND WHAT ELSE IT CAN DO WITHOUT MY CONSENT.

I DO NOT FAULT Chris Pendrick 'extension' on my computer, but do not know how to remove/uninstall completely.

Can anyone help?

https://support.Mozilla.com/en-us/KB/uninstalling%20add-ons#w_how-to-uninstall-extensions-and-themes

Tags: Firefox

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