This happens only on my working PC at my office, which is the only one I leave open 24/7. But colleagues of mine said they have witnessed the issue also off work. Basically, after some time I can only access internally (to the company) hosted websites. Anything else is in a perpetual "loading" phase. Then I need to restart firefox and then it works fine. This has become more and more common in the past month or two. I'm currently using version 106, but I'm sure to have experienced the issue across multiple releases. I've tried this resource, but did not help https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can Is there something I can look at, like some log files, consoles etc., to provide more insight into the issue?