Do plugins auto-update or is there a way to check for updates manually?

To check whether your plugins are up-to-date, go to the Mozilla Plugin Check site.

Once you're there, the site will check if all your plugins have the latest versions. If you see plugins in the list that have a yellow Update button or a red Update now button, please update these immediately.

To do so, please click each red or yellow button. Then you should see a site that allows you to download the latest version. Double-click the downloaded file to start the installation and follow the steps mentioned in the installation procedure.

That works on the android version of firefox? I meant extensions and not plugins anyway, sorry.