Shined up real nice.
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You are right. It works with Tampermonkey. And I find that it is really nice!
Are you planning on adding Grasemonkey 4 support?
I suggest that you add to the description of your script that it is currently incompatible with Greasemonkey.
It did not work on Tumblr.com with Greasemonkey for me. Would not Tumblr use HTTPS?
Also, Nouvellieu, have you seen this: Greasemonkey 4 For Script Authors?