A content filtering and ad-blocking browser extension. I’d probably go bananas without it.
An eye-dropper and color-picker tool for selecting colour values from web pages. A lazy person alternative to inspecting element.
An extension that resizes browser windows to emulate various resolutions. Great for taking consistent webpage screenshots.
All-in-one, easy-to-use online PDF tools. The compress PDF feature is out of this world, often compressing files by 97%.
An extension that identifies fonts, as well as other details like sizing, used on any webpage.