Qf 3.15pre11, but the problem occurred with 3.14 I think also.

The attachment shows my settings for Bling My Tabs!
The behavior is as expected until I rt-click a Qf tab.
After the rt-click, the Hover Tab Color becomes a burnt orange rather than the
deep blue. (It is not necessary to select from the context menu that opens.)

This behavior continues until I exit and reopen Thunderbird (24.3.0).

Created an attachment (id=7801) [details]
config of Bling My Tabs!

Attachment failed on open of new bug. The message said,''The bug was created
successfully, but attachment creation failed. Please add your attachment by
clicking the "Create a New Attachment" link below.''

There is no Create a New Attachment" link on the page.

Interesting. It looks like the right click "steals" the color from the current
tab, let me look into it in more detail.

Created an attachment (id=7802) [details]
3.15 prerelease 51

Found it! I think this bug was introduced when I tried to follow the last
selected color when paint mode is activated. This patch should fix it.
Disregard the new Palette 'Night Vision' for now, this is still experimental.
Oh and: the Pastel palette was somewhat improved, it looks far less "Plasticy"
now.