Code Injector for Chrome
More About Code Injector
Use it to customize appearance of a page, to auto-fill / auto-click forms on a page or to get rid of selective elements (e.g. advertisements) from a page. Get the control back on your browsing experience.
Backup / restore or share your rules using import/export feature (from Options).
Source code for this extension is available in GitHub, original work by L.Sabatelli.