All As I stated in my post, the reports are still a work in progress.  As Graeme rightly pointed out, the inclusion of a "secret decoder ring" would have been helpful.  I will have a legend/help page shortly.  In the meantime I have included the cheat sheet.  Note, I reserve the right to modify these either as I see fit or by anyone's good suggestions.  Seriously, I do plan to make some tweaks. The reports are for the community , so it only makes sense for me to make them as useful as possible Rationale/comments: - green  ===  good, light green === very good (tb68, always first flag to see easily) - cV , pV : current, previous version (some people ping-pong to officially support both 60/68) - 61+ : author has worked past 60, good indication they will hit 68 - 69+ : author has worked past 68, good indication they will continue towards 76 - MailExtension flag is kind of ambiguous.  Currently it just means a manifest file is included. (it would be more helpful to flag extensions that actually implement ME features)   It says nothing beyond that.  I am thinking of modifying or combining with the legacy flags - No maximum version just strives to flag that you cannot count on specific compatibility beyond   any other representation. - Legacy flags (JB suggestion!) currently only get read from the manifest file.  For "non- mailextensions"   I will be adding an RDF parser so I can look at it install.rdf I will also be adding some more status information such as : oWIP  ===  original author, work in progress (feel-good flag) rWIP === new author for replacement extension, work in progress AdoptMe === extension looking for a new home As I progress there may be other things.  Again, suggestions welcome.  Note!  If possible please make an enhancement issue in the repository so we can track. - Thunderbird 68 (Current version) - Thunderbird 68 (Previous version) - Thunderbird 69+ - Thunderbird 60 (Current version) - Thunderbird 60 (Previous version) - Thunderbird 61+ - MailExtension (contains manifest.json) - No maximum version (*) - Legacy Type = bootstrap - Legacy Type = restart required