Command Tabs Opera Extension

background.js

// on proper key press
chrome.runtime.onMessage.addListener(function(request, sender) {
  if (!request.tabIndex) { return; }
  var tabIndex = request.tabIndex;

  chrome.tabs.query({currentWindow: true, index: tabIndex}, function(tab) {
    if (!tab.length) { return; }

    chrome.tabs.update(tab[0].id, {active: true});
  });
});

command-tabs.js

// Command Tabs
var commandIsPressed = false;
var commandKeyCode = 91;
var numberKeyCodes = {
  49: 1,
  50: 2,
  51: 3,
  52: 4,
  53: 5,
  54: 6,
  55: 7,
  56: 8,
  57: 9
};

window.addEventListener('keydown', keyDown, false);
window.addEventListener('keyup', keyUp, false);

function keyDown(e) {
  if (e.which === commandKeyCode) {
    commandIsPressed = true;
  }

  if (!commandIsPressed) { return; }

  // 1-9 number keys
  if (e.which > 48 && e.which < 58) {
    var tabIndex = numberKeyCodes[e.which] - 1; // 0-indexed
    chrome.runtime.sendMessage({tabIndex: tabIndex});
  }
}

function keyUp(e) {
  if (e.which === commandKeyCode) {
    commandIsPressed = false;
  }
}

manifest.json

{
  "name": "Command Tabs",
  "version": "0.1.0",
  "manifest_version": 2,

  "description": "Focus tabs based on their index + the Command key.",
  "developer": {
    "name": "Adrian Unger",
    "url": "http://staydecent.ca"
  },

  "background": {"scripts": ["background.js"]},
  "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["command-tabs.js"]
    }
  ]
}