How are you accessing the e-mail provider? Using Firefox or something else? Many site issues can be caused by corrupt cookies or cache. '''Warning ! ! ''' This will log you out of sites you're logged in to. You may also lose any settings for that website. * [https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored Delete cookies to remove the information websites have stored on your computer] {web link} * [https://support.mozilla.org/en-US/kb/how-clear-firefox-cache How to clear the Firefox cache] {web link} If there is still a problem, [https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode Start Firefox using Troubleshoot(Safe) Mode] {web link} A small dialog should appear. Click '''Start In Troubleshoot(Safe) Mode''' (not Refresh). Is the problem still there? While you are in Troubleshoot(Safe) mode; Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches. ''[https://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration How to disable Hardware Acceleration]'' {web link}

I use Mail app in my Mac. I've already contacted Apple support and did everything they told me to clear cache. I believe that something wrong in settings , I mean its a block for opening links from emails somewhere in Firefox(latest version). But haven't found where and how I can fix it

Troubleshoot Mode hasn't solved the problem

''<p>flyvly [[#answer-1433026|said]]</p>'' <blockquote>I use Mail app in my Mac. </blockquote> Check the computer's default browser setting (just in case). Also, check the settings in the mail app.