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DeleteSimilar 1.3 Requires Restart
Auto-delete similar newer incoming RSS messages.
No GUI (Hands free). To make it work you just rename the RSS folder to start with a minus.
i.e. Google News to -Google News
Uses Trash. Keeps oldest message to preserve Read status.
About this Add-on
To monitor a folder rename the pretty name of the folder to begin with a minus sign (-)
Note: It will only check a message subject as it arrives, but it will delete all but the oldest match when it does the compare. It will use the Trash.
Some content providers prefix their messages with their name followed by a ":" so delete similar will ignore everything before a ":" when it does the compare.
If you just want to edit the length that is compared edit overlay.js, I found 15 to work pretty well though.
It will work on any folder so obviously do not add a minus sign to your inbox!