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

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Reset Firefox in safe mode. Clicked 'Help', then "Restart with Add-ons disabled"

After restarting, Checked "Reset all preferences to Firefox default"

When done, found three new Tabs, one asking if I wanted to continue previous session, a second from Firefox, saying "Welcome to Firefox"

And a third with the heading, "Web Developer Installed"

Clicking on Tab took me to: http://chrispederick.com/work/web-developer/installed/11/ saying "The Web Developer Extension has been successfully installed"

The new website, which also asks for donations, doesn't look related to Firefox. Regardless, NO ONE ASKED MY PERMISSION to install

AM CONCERNED ABOUT UNWANTED EXTENSION AND WHAT ELSE IT MAY DO WITHOUT MY KNOWLEDGE OR CONSENT.

I DO NOT WANT Chris Pendrick's "extension" on my computer, but don't know how to completely delete/uninstall.

Can anyone help?

Reset Firefox in safe mode. Clicked 'Help', then "Restart with Add-ons disabled" After restarting, Checked "Reset all preferences to Firefox default" When done, found three new Tabs, one asking if I wanted to continue previous session, a second from Firefox, saying "Welcome to Firefox" And a third with the heading, "Web Developer Installed" Clicking on Tab took me to: http://chrispederick.com/work/web-developer/installed/11/ saying "The Web Developer Extension has been successfully installed" The new website, which also asks for donations, doesn't look related to Firefox. Regardless, NO ONE ASKED MY PERMISSION to install AM CONCERNED ABOUT UNWANTED EXTENSION AND WHAT ELSE IT MAY DO WITHOUT MY KNOWLEDGE OR CONSENT. I DO NOT WANT Chris Pendrick's "extension" on my computer, but don't know how to completely delete/uninstall. Can anyone help?

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