Vimium C
A keyboard shortcut browser extension for keyboard-based navigation
...It supports all original commands of Vimium and some new useful commands (a full list can be seen in a help dialog in the Vimium C Options page). And it can map the same key sequence to different commands for different websites (and/or for different active elements on the page). It can copy any selected text and current tab's title and URL to the system clipboard, and read the clipboard to search the copied text using a specified search engine. It can also enable/disable websites' image loading and even JavaScript execution, if you trigger its command "toggleCS".