I understand what you are going through. I lost all of my add-ons when I updated too. I only use Lightbeam and Firebug so it was not a big deal. I don't know why this update acted like a new instal, but it did. You are basically going to have to find the add-ons and reinstall them. Lots of people don't know this so I am going to tell you just to be safe. The Firefox button is still here it just has a different look and location. It is the icon with three horizontal lines in the top right. From there it is not too different. Hope you can find every thing again.

I succeeded to find how to return the bottom taskbar with this add-on:

https://addons.mozilla.org/en-US/firefox/addon/the-addon-bar/

But reTwiter button didn't appeared again.:(

I'm glad that you were able to find one. I can't find the Twitter add-on that you had. Or at least it won't work with Firefox 29. I was able to find something that I think will do the trick for you. Firefox Twitter Appp I would say try that. You did not say that you have ad block + yet. So here is the link to that Adblock Plus . Hope this helps.

Thank you, this Twitter add-on appeared both at top and bottom!! And it seem to be from a developer I like!

Glad to hear it. The add-on you found was to help organize add-ons. So you could put them all in one place. It looks like to toolbar at the bottom is customizable. Here is the link to Quick Translator . I could not tell what link check add-on you wanted. That is the only add-on left so I think you can find that one no problem.

Thank you very much!! Now it is almost as before! I'll see the exact name of the check page links add-on at home and will search tomorrow for here.

I noticed also in mode without menu bar as I use the browser the main FF button is gone too. I use it this way and now should change this.:/