Go to the Mozilla Add-ons Web Page {web Link} (There’s a lot of good stuff here) and search for what you want.

See also:

• https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly
• https://support.mozilla.org/en-US/kb/mouse-shortcuts-perform-common-tasks

Note that you can set focus to the Tab bar using Shift+Tab a few times if you first set focus to the location bar (Ctrl+L). You can see a focus ring on the Tab label if this tab has focus. You can use the Left/Right and Home/End cursor keys to navigate on the Tab bar.

Sorry for the delayed reply, but I have resorted to scrolling with my mouse on the tab bar area, as I did not know this was a feature but it is much better than double clicking on the little arrows at the sides of the tab bar. The feature you suggested to me with having the tab bar in focus doesn't really help me all that much, as it requires many key presses to get the tab bar in focus, and then unless I also hold ctrl when pressing the arrow keys it loads each tab which isn't what I wanted, because I could then just do ctrl+tab/ctrl+shift+tab to navigate simply right and left. But thanks anyway. :)

My view here is if you can't read the tabs themselves it might be time to make bookmarks of those sites so you can go back and forth between them. As I know one day you will loose the browser and then try to restore sessions and they will be gone and then no one can do much to help then.