Firefox ships with default settings and then queries updates to those
settings via RemoteSettings.

There's some developer info here -
https://remote-settings.readthedocs.io/en/latest/

But not a lot user facing.

The reason removing it works is because we ship defaults.

Mike

On Thu, Oct 8, 2020 at 2:57 AM Timo Pietilä <[email protected]>
wrote:

> So basically a cache of settings which can be deleted safely and it then
> rebuilds it after FF is started again.
>
> I find these unnecessary cache files that can't be removed from UI and
> have nothing important in them rather annoying.
>
> It feels like there is security/privacy issue too if you can dig any
> history of how FF has been used from those files.
>
> Timo Pietilä
>
> On 8.10.2020 10.17, Wes Kocher wrote:
> > My understanding is that "Remote Settings" is the system Firefox is
> > using to synchronize and distribute preference changes and localized
> > messages between all of the various processes Firefox is using these
> > days as a multi-process browser.
> >
> > On Wed, Oct 7, 2020, 9:50 PM Timo Pietilä <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> >     What are these remote settings? They don't seem to have any impact
> >     on TB
> >     or FF. Are these some kind of cached settings that for some reason
> are
> >     in permanent storage?
> >
> >     Timo Pietilä
> >
> >     On 7.10.2020 17.52, Mike Kaply wrote:
> >      > Unfortunately I don't have a better answer. That file is used for
> >     our
> >      > remote settings database which can be that big.
> >      >
> >      > Mike
> >      >
> >      > On Tue, Oct 6, 2020 at 11:55 PM Timo Pietilä
> >     <[email protected] <mailto:[email protected]>
> >      > <mailto:[email protected]
> >     <mailto:[email protected]>>> wrote:
> >      >
> >      >     Unfortunately no such pref exist in TB or FF.
> >      >
> >      >     Also it isn't GB -size large, just 10+MB, but that is large
> >     enough to
> >      >     cause problems in roaming profiles.
> >      >
> >      >     I just changed all dom.indexed -prefs to false, maybe that
> helps
> >      >     with it
> >      >     getting large.
> >      >
> >      >     Maybe I can change permissions do that FF/TB can't write in
> that
> >      >     directory just to see if that has any effect on FF/TB. If it
> >     doesn't I
> >      >     consider making that change university-wide.
> >      >
> >      >     Timo Pietilä
> >      >
> >      >     On 6.10.2020 18.50, Mike Kaply wrote:
> >      >      > It's used for storing indexedDB data for internal pages.
> >     There is
> >      >     a bug
> >      >      > for the growth:
> >      >      >
> >      >      > https://bugzilla.mozilla.org/show_bug.cgi?id=1517145
> >     <https://bugzilla.mozilla.org/show_bug.cgi?id=1517145>
> >      >     <https://bugzilla.mozilla.org/show_bug.cgi?id=1517145
> >     <https://bugzilla.mozilla.org/show_bug.cgi?id=1517145>>
> >      >      > <https://bugzilla.mozilla.org/show_bug.cgi?id=1517145
> >     <https://bugzilla.mozilla.org/show_bug.cgi?id=1517145>
> >      >     <https://bugzilla.mozilla.org/show_bug.cgi?id=1517145
> >     <https://bugzilla.mozilla.org/show_bug.cgi?id=1517145>>>
> >      >      >
> >      >      > One of the comments says you can set:
> >      >      >
> >      >      >   "dom.indexedDB.dataThreshold" pref to "-1".
> >      >      >
> >      >      > To avoid it.
> >      >      >
> >      >      > Mike
> >      >      >
> >      >      > On Tue, Oct 6, 2020 at 12:56 AM Timo Pietilä
> >      >     <[email protected] <mailto:[email protected]>
> >     <mailto:[email protected] <mailto:[email protected]>>
> >      >      > <mailto:[email protected]
> >     <mailto:[email protected]>
> >      >     <mailto:[email protected]
> >     <mailto:[email protected]>>>> wrote:
> >      >      >
> >      >      >     What is 3870112724rsegmnoittet-es.sqlite (and other
> files
> >      >     like that),
> >      >      >     why it is in \storage\permanent\chrome in
> >     firefox/thunderbird
> >      >     profile
> >      >      >     and why does it keep getting bigger? I can delete
> >     everything
> >      >     in that
> >      >      >     folder and it does absolutely nothing in my browser,
> >     it just
> >      >     rebuilds
> >      >      >     that folder when I restart FF/TB. When it is rebuild
> >     it is at
> >      >     first
> >      >      >     very
> >      >      >     small.
> >      >      >
> >      >      >     If that is not needed why is it "permanent"?
> >      >      >
> >      >      >     How can I get rid of it? It eats up a lot of roaming
> >     space.
> >      >      >
> >      >      >     Timo Pietilä
> >      >      >
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