Fóram Tacaíochta Firefox

On some websites (namely, twitter), middle clicking a post opens it in a new tab. However, whenever this happens, the new tab is always focused, is there a way to prevent this from happening?

This does not occur on websites such as Youtube.com, where middle clicking a video opens it in a new tab, but does not focus it. This is the preferred result.

Likewise, when middle clicking a bookmark, the newly created tab is also immediately focused. Is this preventable aswell?

Thank you for your time.

The issue appeared about two days ago. On the page https://index.hu/ the left click is not working from firefox. This is the most popular news site in Hungary. I also experienced the issue on other sites.

It is working fine from chrome and chromium. The issue is appeared on linux and windows 10 machines as well.

I tried to clear the cache but it does not help.

Please fix this ASAP or I have to delete your browser.

I just upgraded to a 4k monitor and the blinking cursor is so thin I can not see it. I have adjusted the thickness in windows 10 with took care of the issue with Microsoft applications but I can't figure out how to make it thicker in Firefox.

I've tried changing from Firefox theme to System theme but there was no change. Fonts is set to Segoe UI 17.

I have System theme -- auto enabled.

Any suggestions?