hello Romeopastura, the bookmarks (among other data) are stored in browser.db located at data\data\org.mozilla.firefox\files\mozilla\<random string>.default. when i inspect the current permissions in my working profile they are set to -rw-rw----

Hi, I had already tried to move only that file, but in firefox there aren't my bookmarks, if I move the entire folder org.mozilla.firefox deleting the folder created with the new installation bookmarks are there but firefox closes after a few seconds.

Android uses a per-App user permission model. Each app is given a different Linux User ID, this is different each time you install an app. You will need to find out the user ID for the current org.mozilla.firefox and use the Linux command chown to fix the permissions. There may be other issues as well. This method of copying the files is not supported.

Thanks, can you post a guide for linux beginners (step by step)? Alternatively can you post a guide to extract data from browser.db file?

I have not performed either action you are attempting. The database should be readable by SQLite.