Firefox won't open after i downloaded a Page Speed browser add-on

I went to Google Webmaster Central. To check my site performance it asked me to :
Install the Page Speed browser add-on
Use Page Speed to evaluate the performance of your pages and get suggestions on how to improve them. Learn more
Install Page Speed
Install while using Firefox
The "Install Page Speed" being https://dl-ssl.google.com/page-speed/current/page-speed.xpi
It then asked me to restart firefox. I said ok and firefox switched off but never started again. It won't open when i try to start it again.
I have a lot of saved bookmarks and don't want to loose them. Will this happen if i uninstall and reload firefox or is there a way to get this version working again.

Try opening Firefox in [[safe mode]], whilst in safe mode you can access the add-ons manager and uninstall the Page Speed Browser extension. Hopefully this will resolve your problem.

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