Add javascript popup.js
Create directory sites
Create file delicious.js
Create file reddit.js
Add listeners for event click
Add function registerSite
Change function registerSite
Add variable sites
Add site gmail
Replace for-loop by method-call forEach
Add labels to sites
Replace static list of sites by a dynamic list
Create file background.js
Add background-script
Move variable sites to background-script
Add site tinyurl
Create file options.html
Add options-page
Create file options.js
Add form