About web-extension:
3 functionalities accessible from popup:
-apply styles to your current tab for relaxing your eyes, using neutral colors
-timer on page for reminding you how much time do you have till sleep hour, counting down and hide the content of the page when time is off
-reminder for birthdays
Technical functionalities:
popup page & popup script
messaging content <> background <> popup
options
external .txt files in JSON format
DOM injection
jQuery
ajax requests
manifest.json keys:
permissions
browser_action
content_scripts
background
options_ui
APIs:
tabs.sendMessage()
runtime.onMessage
browser.tabs.onActivated
browser.tabs.onUpdated
