Can I combine or merge data (bookmarks, cookies, settings, passwords ...) from two profiles into one?
I want to combine Mozilla profile data from two computers (my spouse's and mine) into only one profile in a single computer. I guess importing one profile into the other would do so, but I do not find this command. Backup and restoring seems to apply to only one profile. Thanks in advance for your help.
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For bookmarks, export the bookmarks on one profile to an HTML file and import that file into the other. Using HTML will add the bookmarks to those that already exist. For details on doing that see Export Firefox bookmarks to an HTML file to back up or transfer bookmarks and Import Bookmarks from an HTML file.
If you think you will have quite a few duplicate bookmarks after merging them and want to remove them, you can use the CheckPlaces add-on.
For passwords, you can use another add-on, Password Exporter, that lets you export passwords from one profile and import them into the other.
I do not know of a way to import the cookies.
You can't merge settings from one profile to another profile.
It is possible to export some data like bookmarks or names and passwords, but for other data it is impossible or would require editing text files.
Restoring a JSON backup will replace all your current bookmarks (you get a warning about that), so you need to use an HTML backup if you want to merge the bookmarks with the ones that you already have.
See Import Bookmarks from an HTML file
Extensions are best be reinstalled and not copied.