Store bookmarks (and passwords?) into a separate json file

[bbondy]

Sometimes we have to ask users to clear session storage because of some bug as a workaround. It might be better to have these stored separately because they are the most important thing to users.

[Segment0895]

And history, as well. Using Firefox as example, all three are in: places.sqlite (bookmarks & history), logins.json and key3.db for the master password.
Alternatively, a functionality like Firefox's "Refresh Firefox".

[luixxiul]

@pedro7 I created a issue for it, #1864

[NejcZdovc]

closing in favor of #9978