How to remove 2 icons in Firefox when I select some text?

In my Firefox 85 under kubuntu 18 when I select some text on a page I see
2 icons visible, like edit and twitter : Imgur: The magic of the Internet
How can I remove them ?

You can’t, it’s not a Firefox thing but something that the site owner wants you to have (whether you like it or not).
I find it annoying, too.