Just about two years since the last review (not mine), and this works great with Thunderbird 31.6.0. I'm now able to choose whatever colors I like for individual Lightning calendars (haven't tried anything else in Lightning yet).
Note: it's also possible to change the Inbox subject line tag colors and the color does appear in the Tools > Options > Display > Tags box but, unfortunately, Thunderbird reverts to black in the Inbox. I don't believe this is the fault of the Rainbowpicker.
I'm using this in Thunderbird and it's greatly appreciated.
I've been trying to find an easy way to customize my (Lightning) calendar colors because the color picker provided has a very limited amount of colors and most of them I don't care for, but now I can use any color that I desire.
Sincere thanks for your time, work, and effort put into developing this add-on.
I wrote the author a couple of days ago to ask if he would bump up the maxversion, since I had been using the extension without problems in various Firefox 4 betas. I was also bothered by the fact that the window always appeared in the top left corner of the screen. Imagine my surprise when he fixed both issues that same day!
As for the extension itself, it does exactly what it says. It's one of those common-sense features that should have been included in Firefox in the first place.
I was really looking forward to being able to use this addon, but it it cannot be installed due to incompatibility with the latest version of Thunderbird. I am very disappointed - are there any plans to rectify the compatibility issue?