See if you can "pair" those two devices - they need to have Firefox running on both devices at the same time.

https://support.mozilla.com/en-US/kb/add-a-device-to-firefox-sync

Thank you for your reply. However, that guide assumes you have a desktop version of Firefox to insert the codes into and start the pairing to the second device (which can be a desktop Firefox or an Android Firefox), while I need to do the other way around, that is start the pairing from the Android Firefox. If it is possible, how can I insert the pairing codes in the Android Firefox?

See:

• [/questions/942893]
• http://www.freefilehosting.net/aboutsynckey-11-fnfx

Unfortunately also your "fixed" xpi doesn't get installed because of incompatibility. I also took your idea and tried the usual trick of modifying the maximum allowed version in the install.rdf, but again it didn't work. Still, thank you, that was worth trying. At this point I think that I will just copy my bookmarks from the tablet and reset the account.

I've bumped the maxVersion of the aboutsynckey-11-fnfx file, so it should install now.

You should see the extension on the Tools > Add-ons > Extensions page (no restart needed) and see the extensions page if you type about:sync-key in the location bar and the sync key if sync has been set up.

Do you mean the link you posted above? That is the one I tried (I have also checked again now), but it doesn't work for me, on Android it says it can't install because is not compatible with firefox 17. Note that on the desktop (also version 17) it works. It seems strange, because on the other thread (that you linked) it worked for the other user.

Use the accounts menu in android system settings instead of the one in Firefox settings, it is different and has a pairing option. (credits go to Nawak)