Firefox for Android does support extension sync, but not all extensions are compatible with this feature. To sync extensions between Firefox on your PC and Firefox for Android, you need to: 1)Make sure that you are signed in to your Firefox account on both devices. 2)Install the same extensions on both devices. 3)Enable the "Sync Extensions" option in the Firefox "Sync" settings on both devices. This option can be found in the "Sync" section of the "Preferences" menu. If you have followed these steps and your extensions are still not syncing between your PC and Android device, it's possible that the extension you are trying to sync is not compatible with this feature. In this case, you may want to contact the extension developer for more information or try using a different extension that does support syncing.