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CloseReview for Thunderbird Message Filter Import/Export Enhanced by Afrow UK
Rated 5 out of 5 stars
As with the original plug-in, you can find the Import menu item under Tools -> Import Filters. This is under the original menu bar, not the newer "Thunderbird Menu" akin to Firefox's. Right click on top of Thunderbird and tick "Menu Bar" to view it. As for no file extension for the exported file, just add one yourself - it's not necessary though.
To create your own collections, you must have a Mozilla Add-ons account.