Firefox does not allow URLs, nor even open a new tab, even after reinstall and in the safe mode
For a week or so Firefox does not behave properly. I can open menus, I can start it in the Safe Mode, but regardless of what I do only the blank screen appears, and I cannot effectively enter any address (I mean I can, but pressing <Enter> does nothing). The '+' icon for adding a new tab does not work either. Some icons are also "dead", like e.g. reload, or the "go to" arrow. F12 does not work, but F11 does. There is no apparent reason for this behavior, no change in the OS known to me. Firefox reinstall with refresh did not solve the issue.
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What's your computer system and Firefox version?
Type about:preferences#advanced<Enter> in the address bar.
Under Advanced, Select Network. Look for Configure How Firefox Connects and press the Settings button. If you are using a proxy, make sure those settings are correct. If there is no proxy, first try No Proxy. If there is a problem, then try System Proxy. ++++++++++++++++++++++++++ Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;
- Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
- Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see
https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet Configure firewalls so that Firefox can access the Internet.
[56+] Type about:preferences#general<enter> in the address bar. Look for Network.