http://zetcode.com/gulp/getting-started/ https://gulpjs.com/docs/en/getting-started/creating-tasks https://www.freecodecamp.org/news/super-simple-gulp-tutorial-for-beginners-45141974bfe8/ https://css-tricks.com/gulp-for-beginners/ https://gulpjs.com/docs/en/getting-started/watching-files -- debug https://gist.github.com/stsvilik/46bf34f76910fcf515ea00650134190f -- gulp + browsersync https://www.browsersync.io/docs/gulp https://wpbeaches.com/getting-browsersync-running-with-gulp-4-and-valet/ https://github.com/gulpjs/gulp/blob/master/docs/recipes/minimal-browsersync-setup-with-gulp4.md
-- permissions and url matches http://www.adambarth.com/experimental/crx/docs/content_scripts.html https://developer.chrome.com/extensions/match_patterns
-- other https://developer.chrome.com/extensions/content_scripts https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_scripts https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_scripts
-- web-ext package https://www.npmjs.com/package/web-ext
-- Content Scripts vs. Background Scripts https://medium.com/@vanessajimenez_85032/chrome-extensions-content-scripts-vs-background-scripts-7bbd01f9dbe6
-- polyfill https://github.com/mozilla/webextension-polyfill
-- nice examples usage: https://viblo.asia/p/chrome-extension-getting-started-djeZ1p8GKWz https://viblo.asia/p/chrome-extension-communicating-between-popup-and-content-script-Qbq5QjQXKD8
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Anatomy_of_a_WebExtension https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_scripts https://developer.chrome.com/extensions/background_pages
https://ask.xiaolee.net/questions/1140496 https://stackoverflow.com/questions/31111721/pass-a-variable-from-content-script-to-popup/31112456 https://stackoverflow.com/questions/20019958/chrome-extension-how-to-send-data-from-content-script-to-popup-html