Here I'm launching a test site for demostration:
https://gif.syshut.com/
You can see the thumbnail of the first post is blocked, for the pic is of GIF, and this rule is matched:
Code: Select all
##a[href*=".com/?p="] > img[src$=".gif"]
Note: this is just a test site, but all WordPress powered sites with this form of thumbnail displaying method, and using default type of permalink, can be mis-blocked.