Bookmarklets
Bookmarklets (or favelets) are bookmarks for your browser that, when clicked, rather than loading a favourite website – run JavaScript to modify the page you are viewing.
Despite the optimistic plural in the title for this page, I have only one very simple example to share.
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Tidy URL Bookmarklet
Strips Google Analytics Tracking parameters from the URL of the currently viewed web page. Uses history.replaceState if available to avoid the need for a page reload.