Initialize using Firefox Jetpack SDK
Add basic README file
Add test icons
Add test listener
Add API module
Add main module
Add UI module
Write package.json
Add // before main.sendToInstapaper
Change "point hotkey" to "modifier" in simple-prefs
Write listener injection script
Process 201 status code as successful
default: → case 500:
Inject listener if modifier is set
Better PageMod
Change images to more suitable ones (still don't like it though)
Resolve checkModifier function when initializing
Shift as a default modifier
Better text
Remove console.log() calls