I cannot connect with tiny.pl

That is up to the site hosting the site to see why their access isn't working when using Firefox to go the site.

I can get to the site. see screenshot What OS? What version of Firefox? What are you getting when you try the site. Post a screenshot Do you have the same issue with Firefox in [https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf Troubleshoot Mode]? Did you try clearing the browser cache? https://support.mozilla.org/en-US/kb/how-clear-firefox-cache# You can try to clear all items for a single site. https://support.mozilla.org/en-US/kb/remove-websites-address-bar-suggestions