Cleanissue removes ":+1:" comments from issue discussions on GitHub.com. The current version can detect the plain +1 and the :+1: emoticon.
You will get a notification in the issue title with the amount of hidden comments
This is an unpacked chrome extension. You need to get your browser into the developer mode, then you can load unpacked chrome extensions.
The extension needs read-write permissions on GitHub.com, but well, that was expected ;)
MIT