Videos are good as long as you also provide copyable content. Gifs not so much since I can’t pause.
I have a keyboard shortcut bound to run mpv with the content of the clipboard, so right click on gif, "Copy Image Link", hit the keyboard shortcut and wait for the gif to open in mpv where I can pause, speed up, speed down, scroll etc.
Also useful for any video or audio on the web, since mpv is (for me) much nicer than any built-in player.
Specifically for running MPV with URL-links/video sources/iframe sources as an argument.