I want to remove the "X" (close tab)

That is for the close 'X' on each tab on the window. You want to remove the close window 'X' upper right corner?

FredMcD said

That is for the close 'X' on each tab on the window. You want to remove the close window 'X' upper right corner?

No I want to remove the X's from the tabs. I think they are in my way and I only use middle-click to close tabs anyway.

ideato said

Hello Dagur, in what ff version ? this preference removed in Firefox 31 ! https://bugzilla.mozilla.org/show_bug.cgi?id=865826 try the next add-on : No Close Buttons add-on thank you

My understanding was that I could just add the preference to about:config and it would work as before. It's very user unfriendly to have to install an addon to do something that's always been there.

Dagur said

ideato said

Hello Dagur, in what ff version ? this preference removed in Firefox 31 ! https://bugzilla.mozilla.org/show_bug.cgi?id=865826 try the next add-on : No Close Buttons add-on thank you

It's very user unfriendly to have to install an addon to do something that's always been there.

agree :-)

http://kb.mozillazine.org/Browser.tabs.closeButtons