Copy and paste the source code (linked in the titles) prepended with javascript: into your bookmarks and open the bookmark to activate it.
If there is an issue, try running it through JSObfuscate first.
JavaScript bookmarklet that copies all the links on a page to the clipboard, then separates them by internal links and external links
Extract Schema Markups and show them on a new tab
Filter the current page in the Search Console performance report
Highlight all elements
Highlight all Heading Tags
Show all preconnect, dns-prefetch, preload, and prefetch of the current page.
Show Alt attribute of images on them