Developer reply by thunderspeed
Rated 4 out of 5 stars
Potentially a really useful app BUT big problem hugely affecting useability and that is the Account Colours, (as several other reviews mention)
I have just sent an email to the wrong address as I couldn't read the recepients address correctly on a brown background.
Making selectable colours or at least pastel shades would perfect this plug-in
The color can be selected in Idenity Chooser's settings (Hamburger Menu -> Addons -> Identity Chooser).
To create your own collections, you must have a Mozilla Add-ons account.