Firefox opens but it won't load any websites. There's no indication that the browser is trying to load the webpage when I select a site from my bookmarks or history, or when I type an address directly into the address bar. The new tab screen is also completely blank. Other browsers are able to load webpages as normal. I have tried restarting my computer, refreshing Firefox, re-installing Firefox, removing and re-adding Firefox to my firewall access, and creating a new Firefox profile, but the problem persists.