We’ve restored the Bookmarklet functionality to the Press This! plugin that was created for WordPress 4.9 when they moved this functionality to a plugin from the core.
To use you must first delete the original Press This! plugin and then upload and activate this one. Otherwise, it works the same as before now.
Click to download: press-this-restored 1.1 v1.1.0 – HTTPS fix
Click to download: press-this-restored v1.0.0