great, but needs more work Rated 4 out of 5 stars
Every version of Lightning I've had in the last two years does not correctly refer you to the web page about Lightning when you click the more button then click on the homepage url. You always get a page not found error. As well, Lightning never finds updates unless Thunderbird has just been updated, then it finds and downloads the updates.This review is for a previous version of the add-on (2.6).
Ah yes, the website. Sorry about that. We have a prototype for a new website, but unfortunately its waiting on Mozilla webdev to finish and is currently not a priority for them as we are a community project and their resources are limited.
Regarding the updates, there are really no intermediate versions. Per Thunderbird version there is one Lightning version, due to the binary component we have.