About this Add-on
Since 2.0 version in the options:
1- Changes are done into local TB messages database, not into the message (Subject from Header doesn't change).
2- Changes are directly into header, so it is imap compatible
To create your own collections, you must have a Mozilla Add-ons account.
Some add-ons ask for permission to perform certain functions. Since you’re in control of your Firefox, the choice to grant or deny these requests is yours.
Please note this add-on uses legacy technology, which gives it access to all browser functions and data without requesting your permission.