TamperMonkey

Have you ever went on a website and while you mostly like it, there's just something off about it that you just want to tweak?

You can! With TamperMonkey, you can create or import a variety of scripts that can enhance your browsing experience. Popular scripts used by TamperMonkey users include adding extra search buttons to Google's home page - maybe you want a PDF search or a search only on some website. Or a mouseover popup for reddit - don't need to click to see images, just mouseover! There are a few for say removing YouTube ads. All this and more made possible by scripting with TamperMonkey.

As seen in the screenshots, you can easily manage a variety of scripts, see and change their code, then customize which websites that each script should activate for.

TamperMonkey is available for multiple browsers, like Chrome, Microsoft Edge, Firefox, Safari and Opera Next, and is a very popular extension with millions of users.