I see as a separate tasks:

 * "Default Assignee" button & co.
 * some other additional buttons (might be merged with previous
   one)
 * fixing Attachments
 * parse backtrace and add it
 * Xorg.0.log grepping & chipMagic
 * isEnterprise, isTriaged (both could be eliminated; where they
   are used?)
 * setBranding
 * queryUpstream, queryBugzilla, sendUpstream
 * close upstream

Some of these can be merged together, but certainly at least four
modulses are certain