I would definitely try clearing cache and cookies on any of the browsers that are giving you problems. You can use the built-in methods or a program such as CCleaner to do that. I have seen a lot of bizarre issues with web browsers that were related to cache corruption and clearing cache entirely returned things to normal. You could try just clearing cache first and if that doesn't work then also clear cookies.
In the address bar, type "about:config" (with no quotes), and press Enter.
Click "I'll be careful, I promise"
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