Hello azdec. You can check the add-on's page at [http://addons.mozilla.org addons.mozilla.org] if it's just one or two. I believe there is one extensions in the add-ons gallery that lets you see whether your add-ons are compatible with newer versions of Firefox. But you'll have to search for them, since I don't know how it's called. I will remind you that if you want an add-on to be compatible with a newer version of Firefox, you need to contact its author. Also, the version of Firefox you are using at the moment has been discontinued and is no longer supported. Furthermore, it has known bugs and security problems. I urge you to update to the latest version of Firefox, for maximum stability, performance, security and usability. You can get it for free, as always, at [http://www.getfirefox.com getfirefox.com].