Please make it check for shortened Youtu.be URLs of the same video.
Yes they are technically different URLs but this does not matter to subreddit mods

Great add-on but do wish that I could sort by points or comments

Love this, would you please consider adding an option to sort by most upvoted submissions? Would like to see from descending order.

suggestions:

should have option to be able to blacklist sites, or whitelist specific sites(only check for whitelisted sites)

should be able to click on the subreddit (to open in new tab the subreddit when clicked on subreddit name, instead of only having the option to go to post), and the same thing for uploader name.

maybe a search box would also be useful

and it would be super useful if users could upvote/downvote each post from reddit checker, otherwise the up/down arrows should seem more disabled (slightly decreased opacity).

EDIT: also... users should be able to paste a custom link in the reddit checker..

Why? Because if people share a youtube video on reddit in the short-form (youtu.be/) instead of (www.youtube.com/watch?v=) then it doesn't show up on reddit checker at all.

So Perhaps there should be a little search icon on the top, when clicked to open up a search bar, and when you paste a link.. to automatically check on reddit.

Or maybe.. reddit checker should do that automatically for various sites such as YouTube.

Works perfectly and very fast, no complaints.