We've worked out what was happening here - although we are now using the 
Mozilla build of ESR 60, we had some cases of using the Redhat/CentOS 
build (on older CentOS 6 installs that can't run the Mozilla build)

As I mentioned previously, the Redhat/CentOS ESR 60 build bundles a 
number of langpacks, so they had been previously copied to user profiles 
from this install

Setting 'extensions.installDistroAddons' to 'false' doesn't actually 
doing anything now as we are using the Mozilla build of ESR 60 (although 
it would if were still using the Redhat/CentOS build)

Thanks

James Pearson

James Pearson wrote:
> 
> We're just using the Mozilla provided tar archive - so there is no 
> distribution directory in that package ...
> 
> We're going to see if we can reproduce the issue and attempt to 'see' where 
> they are coming from
> 
> James Pearson
> 
> ________________________________
> From: Mike Kaply [[email protected]]
> Sent: 26 June 2019 15:22
> To: James Pearson
> Cc: [email protected]
> Subject: Re: [Mozilla Enterprise] Preventing Firefox from downloading 
> langpacks ?
> 
> What package are you using? Based on the fact that pref is fixing things, it 
> sounds like the language packs are in the distribution directory of the 
> Firefox package you are using.
> 
> That's where they are being installed from.
> 
> Mike
> 
> On Wed, Jun 26, 2019 at 1:06 AM James Pearson 
> <[email protected]<mailto:[email protected]>> wrote:
> We're running ESR 60 (Mozilla build) on Linux (CentOS 7)
> 
> I did find the following:
> 
>   https://access.redhat.com/discussions/3509781#comment-1322671
> 
> which is about the RedHat/CentOS rebuild of  ESR 60 copying in langpacks - 
> however, this build does bundle a number of langpacks as part of the 
> installed package
> 
> However, we are not using the RedHat/CentOS package - and don't have the 
> langpacks installed anywhere, however, users are getting langpacks in their 
> Firefox profiles ...
> 
> The workaround suggested in the above link is to set 
> 'extensions.installDistroAddons' to 'false' - which appears to fix the 
> problem for us
> 
> I'll do some some more poking about to see if I can find out 'how' these 
> langpacks are being installed in user profile directories
> 
> James Pearson
> ________________________________
> From: Mike Kaply [[email protected]<mailto:[email protected]>]
> Sent: 25 June 2019 20:25
> To: James Pearson
> Cc: [email protected]<mailto:[email protected]>
> Subject: Re: [Mozilla Enterprise] Preventing Firefox from downloading 
> langpacks ?
> 
> We don't download language package in Firefox 60. We do in 68 if a user 
> selects a new language.
> 
> If a language pack is already installed via some mechanism, we might grab an 
> update for that language pack and put it in the profile.
> 
> Can you provide more details on what you are seeing?
> 
> Mike
> 
> On Tue, Jun 25, 2019 at 1:59 AM James Pearson 
> <[email protected]<mailto:[email protected]>> wrote:
> Most of our users don't have access to the Internet, but for users that do, 
> we've noticed that ESR 60 appears to download a set of langpacks to their 
> Firefox profile - the total size of all these langpacks is 'only' about 65Mb, 
> but it does eat into the rather meagre home directory quota we have ...
> 
> Is there any way to turn off these downloads - and use (single copies of) 
> centrally installed langpacks instead ?
> 
> I'm not aware of this happening with ESR 52 (and earlier)
> 
> Thanks
> 
> James Pearson
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