Here are my bookmarklets, which are simple scripts injected via bookmarks.
- Create a bookmark - click the star in the URL (in chrome)
- Right click the bookmark
- Click edit
- Paste the js code in the URL field
Make sure the JS you add to the URL field follows the format of the protocol 'javascript:' followed by an IIFE.
For example:
javascript:(function(){//some code})()
I orginally learned about bookmarklets from Coding Train: https://www.youtube.com/watch?v=DloHqUfPbJc