When we upgraded to 2.5.2 we didn't realize that the tag had moved from
when we first tested it. The v2.5.2 tag that we upgraded to was
essentially 2.5.1 + one script fix that doesn't impact the running
service. This did not include the fix for no skin formatting on firefox.
More details can be found in this issue:
https://github.com/ether/etherpad-lite/issues/7211
Since then upstream has created a 2.5.3 release which appears to be what
was intended for the 2.5.2 release. At least diffing the Dockerfine and
settings.json file contents against the original 2.5.2 release shows no
difference. The full changelog can be found here:
https://github.com/ether/etherpad-lite/blob/v2.5.3/CHANGELOG.md
Change-Id: Ic6d84563ee791a7ba20f73c138a3c1a6f9797167
7689d06722