Sync isn't instant update sometimes it takes time from one change to update to another and they need to be both logged in and active to update correctly. This isn't like a DropBox where one change updates instantaneous and there needs to be time allowed for the data to update to match. Here's more read on sync to familiarize oneself.

https://support.mozilla.org/en-US/products/firefox/sync https://support.mozilla.org/en-US/products/firefox/sync-and-save https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer https://support.mozilla.org/bm/products/firefox/sync-and-save

thanks! I would like to try and create an extension that does this, could you let me know how I should contact Mozilla about this? since mobile extensions are very limited

Extensions support are provided by the extension creator, Firefox only hosts extensions/addons - support is provided by the creator of the extensions/addons.

ok thank you very much

Extensions support are provided by the extension creator, Firefox only hosts extensions/addons - support is provided by the creator of the extensions/addons.

One can still ask for help here as many people who help out here may have varying experience with the mentioned Extensions. They are not required to go elsewhere for help. Besides not all independent extensions authors have time to do support or provide a support place of their own (like a forum) for them.

thanks! I would like to try and create an extension that does this, could you let me know how I should contact Mozilla about this? since mobile extensions are very limited

This is not really the best place to ask for help on making your own Extensions however there is https://discourse.mozilla.org/c/add-ons/35 and https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Your_first_WebExtension to get you started.