What’s new in Safari Web Extensions

// Manifest version 2
browser.tabs.executeScript(1, {
  frameId: 1,
  code: "document.body.style.background = 'blue';"
});

// Manifest version 3
function changeBackgroundColor(color) {
  document.body.style.background = color;
};

browser.scripting.executeScript({
  target: { tabId: 1, frameIds: [ 1 ] },
  func: changeBackgroundColor,
  args: [ "blue" ]
});

// Manifest version 2
browser.tabs.executeScript({ 1,
  file: "file.js"
});

// Manifest version 3
browser.scripting.executeScript({
  target: { tabId: 1 },
  files: [ "file.js", "file2.js" ]
});

// Add styling
browser.scripting.insertCSS({
  target: { tabId: 1, frameIds: [ 1, 2, 3 ] },
  files: [ "file.css", "file2.css" ]
});

// Remove styling
browser.scripting.removeCSS({
  target: { tabId: 1, frameIds: [ 1, 2, 3 ] },
  files: [ "file.css", "file2.css" ]
});

// Manifest version 3
"web_accessible_resources": [
    {
      "resources": [ "pie.png" ],
      "matches": [ "*://*.apple.com/*" ]
    },
    {
      "resources": [ "cookie.png" ],
      "matches": [ "*://*.webkit.org/*" ]
    }
]

// Manifest version 3
"action": {
  "default_icon": {
    "16": "Images/icon16.png"
  },
  "default_title": "defaultTitle"
}

// Manifest version 2

"content_security_policy" : "script-src 'unsafe-eval' https://*apple.com 'self'"

// Manifest version 3

"content_security_policy" : { "extension_pages" : "script-src 'unsafe-eval' 'self'" }

// manifest.json

"permissions": [ "declarativeNetRequest" ],

"declarative_net_request": {
  "rule_resources": [
    {
      "id": "my_ruleset",
      "enabled": true,
      "path": "rules.json"
    }
  ]
}

// Rules that won't persist

browser.declarativeNetRequest.updateSessionRules({ addRules: [ rule ] });

// Rules that will persist

browser.declarativeNetRequest.updateDynamicRules({ addRules: [ rule ] });

// In the webpage
let extensionID = "com.apple.Sea-Creator.Extension (GJT7Q2TVD9)";

browser.runtime.sendMessage(extensionID, { greeting: "Hello!" },
 function(response) {
    console.log("Received response from the background page:");
    console.log(response.farewell);
});

// In the webpage
let extensionID = "com.apple.Sea-Creator.Extension (GJT7Q2TVD9)";

browser.runtime.sendMessage(extensionID, { greeting: "Hello!" },
 function(response) {
    console.log("Received response from the background page:");
    console.log(response.farewell);
});

// In the background page
browser.runtime.onMessageExternal.addListener(function(message, sender, sendResponse) {
    console.log("Received message from the sender:");
    console.log(message.greeting);
    sendResponse({ farewell: "Goodbye!" });
});

// Determining the correct identifier

function determineExtensionID(extensionID) {
  return new Promise((resolve) => {
    try {
      browser.runtime.sendMessage(extensionID, { action: 'determineID' }, function(response) {
        if (response)
          resolve({ extensionID: extensionID, isInstalled: true, response: response });
        else 
          resolve({ extensionID: extensionID, isInstalled: false });
      });
    }
  });
};

// background.js

browser.runtime.onMessageExternal.addListener(function(message, sender, sendResponse) {
  if (message.action == "determineID") {
    sendResponse({ "Installed" });
  }
});

// manifest.json

"permissions": [ "storage", "unlimitedStorage" ]