ThunderBird add-on called "Paste Feed Location" enhances the feed subscription dialog with a paste context menu, simplifying the process of inputting feed locations.
One thing I noticed, however, is that this extension may not be necessary for long. Apparently, there is a bug in the Thunderbird software that prevents the paste option in the subscription dialog. Once this bug is resolved and the patch is checked in, the extension will become obsolete.
Overall, I highly recommend Paste Feed Location for ThunderBird to any Thunderbird user who wants to streamline their feed subscriptions. The only requirement is that you have Thunderbird 1.5 to 2.0a1 installed. So give it a try and see how it can improve your workflow!
Version 0.4: N/A