The binary package purebrowser was previously packaged from source package purebrowser.
To minimize delta towards Debian, and ease tracking differences, binary package purebrowser is now packaged from source package firefox-esr.
Please therefore let through to green the binary packages from (our fork of) source package firefox-esr.
As explained by Matthias on irc, package ban is source-specific: Banning Debian as source of firefox-esr continue to make sense and does not block upload of same-named firefox-esr ourselves.
Therefore closing this issue as invalid.
apparently something blocks http://repo.pureos.net/pureos/pool/main/f/firefox-esr/ from entering green.
Raising priority, as PureOS currently ships with a very old and known broken release of (rebranded) Firefox.
Apparently it breaks a bunch of stuff (garmin-plugin etc.), but that looks like a false-positive to me. The real issues are the -dbg packages being seemingly broken due to the Firefox package taking over binaries from the existing PureBrowser package.
I'll enforce that migration manually.
http://master.pureos.net/migration/landing/green/excuses/firefox-esr/52.5.0esr-1pureos2