Rated 4 out of 5 stars

TB 31.2.0 + Tag Toolbar 0.8.35

When trying to change character encoding via Option - Encoding - something in message compose window, error popup appears and encoding cannot be changed.

[JavaScript Application]
ReferenceError: BrowserSetForcedCharacterSet is not defined

Disabling Tag Toolbar solves this problem.

With TB 30, no problem.

Similar problem seems to be caused also by Priority Switcher extension: https://addons.mozilla.org/en-US/thunderbird/addon/priority-switcher/reviews/603200/

This review is for a previous version of the add-on (0.8.35).