I currently have Firefox 55.0.2. I checked for updates it it began installing an update. I restarted Firefox but the update did not work. If I check for updates, it downloads again. I went to update history and it shows install pending. Every time I open Firefox now, the Firefox software updater popup box appears. I choose yes but the update still does not complete. My settings tab said that Firefox could not be updated and to install a fresh copy. I did this but the update still did not work. I tried troubleshooting and refreshed Firefox. Nothing. I do not know what else to do. Any tips would be appreciated.