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<big>'''Add-ons Guide for Thunderbird 57 to Thunderbird 60 ESR'''</big>
(For developer information about Thunderbird 61 and beyond visit the [https://wiki.mozilla.org/[Thunderbird/Add-ons_Guide_63 ons Guide 63|Add-ons Guide 63]]. Note: Thunderbird 61 and 62 betas were skipped. The next beta after 60 is 63.)
'''Ask Questions, Get Help''': Developers are encouraged to ask for help and advice in the mozilla.dev.apps.thunderbird newsgroup. (see [[Thunderbird/CommunicationChannels#If_you.27re_a_developer|Communication Channels]] Please check this document and ask questions in a forum before filing a bug report. Also, if you target version is 60, test and fix your add-on using [https://getthunderbird.com version 60 release], not nightly builds or beta.
