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Other extensions can query the assigned contextual identity of a given URL, if they have the contextualIdentities permission.

API

browser.runtime.sendMessageExternal('@testpilot-containers', {
  method: 'getAssignment',
  url: 'https://example.com'
}).then((assignment) => {
  // Use result
});

HTML/DOM tree structure (nodes, elements, parent/child)
Roots and the document root
Anatomy of a document
CSS selectors and specifity
Cascade order
Block model -> blocks don't belong into inlines and how the block model layout works (block direction, inline direction)
Other display models and how there's an inner and outer display mode
Overlaps (earlier HTML draws on top of later html, child is above parent)
non-static positioning
Semantics

	var uas = () => {
	// Once could just iterate through the ASCII code but finding the characters in builtin Objects is more fun!
	var emptyString = new String();
	var l = (new String(null)).split(emptyString).pop();

	var earr = (new String(undefined)).split(emptyString);
	var d = earr.pop();
	var e = earr.pop();

	var oarr = (new String(Object())).split(emptyString);

	/*
	* This Source Code Form is subject to the terms of the Mozilla Public
	* License, v. 2.0. If a copy of the MPL was not distributed with this
	* file, You can obtain one at http://mozilla.org/MPL/2.0/.
	*/
	"use strict";

	/**
	* Returns API data to store.
	*

	const PREFS = {
	"translate_now_destination_language": {
	"type": "value",
	"default": "en"
	},
	"translate_now_source_language": {
	"type": "value",
	"default": "auto"
	},
	"translate_now_reuse_tab": {

	const STRINGS = {
	"elementid": "stringid"
	}

	for(let i in STRINGS) {
	document.getElementById(i).textContent = browser.i18n.getMessage(STRINGS[i]);
	}

	"use strict";

	const ICON_SIZE = 64;

	const getIcon = async (count, size = ICON_SIZE) => {
	const canvas = document.createElement("canvas");
	const ctx = canvas.getContext('2d');
	const {
	bgColor,
	color

	/* This Source Code Form is subject to the terms of the Mozilla Public
	* License, v. 2.0. If a copy of the MPL was not distributed with this
	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

	this.EXPORTED_SYMBOLS = [ 'ConversationStatusUtils' ];

	const {Services} = ChromeUtils.import("resource:///modules/imServices.jsm");

	const CHAT_TAB_HIDDEN_TOPIC = "chat-tab-hidden";
	const CHAT_TAB_SHOWN_TOPIC = "chat-tab-shown";

	class PollEndpoint {
	constructor(aOpts = {}) {
	this.poll = aOpts.poll;
	this.state = Object.assign({
	isVisible: false, // timeline visibility (as in, are individual tweets visible)
	isFocused: false, // IM tab focus
	rateLimit: Infinity,
	remaining: Infinity,
	resetTime: Infinity,
	requestsPerPoll: 1,

	render() {
	if(this.props.clip) {
	return (<Clip .../>);
	}
	else {
	return (<Loader/>);
	}
	}