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Firefox will not open

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Hi, Firefox was already running, but got stuck when trying to go to a website I visit regularly. There was a pop-up about browser-extensions but that disappeard again fast. I forced Firefox to stop. Then tried to start it up again, but it won't open anymore. Also restarted the computer - again, Firefox won't open. What can I do? Thanks! Lise

Hi, Firefox was already running, but got stuck when trying to go to a website I visit regularly. There was a pop-up about browser-extensions but that disappeard again fast. I forced Firefox to stop. Then tried to start it up again, but it won't open anymore. Also restarted the computer - again, Firefox won't open. What can I do? Thanks! Lise