Firefox WebExtention API: TypeError: browser.browserAction is undefined

Question

在将我的旧 Firefox 附加组件迁移到 WebExtension API 时，我收到此错误时无法理解：

TypeError: browser.browserAction is undefined

这里是 manifest.json:

{

  "manifest_version": 2,
  "name": "My Login",
  "version": "3.0",

  "description": "Login to my page",
  "homepage_url": "https://localhost",
  "icons": {
    "48": "icons/button-1.png"
  },

  "permissions": [
    "activeTab", "storage"
  ],

  "browser_action": {
    "default_icon": "icons/button-1.png",
    "default_title": "Login"
  },


  "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["index.js"]
    }
  ],

  "options_ui": {
    "page": "options.html"
  }
    }

这里是 index.js:

function handleClick() {


    var loginUserName, loginPassword;

    var URL = window.content.location.href;

    var doc = window.content.document;


}

browser.browserAction.onClicked.addListener(handleClick);

所以当我转到 about:debugging 和加载我的插件作为临时插件。

Options.html、options.js 和按钮-1.png 确实存在 - 我只是不把它们放在这里。

在 Firefox 55.0.3（32 位）中观察到。知道为什么会发生此错误吗？

谢谢， 浣熊

Answer 1

browser.browserAction 应该在后台脚本中调用，而不是像您正在做的那样在内容脚本中调用。所以假设这段代码在 background.js:

function handleClick() {
    console.log("do something.");
    // If you want to something with the content, you will need a content script and messaging
}

browser.browserAction.onClicked.addListener(handleClick);

您在 manifest.json 中添加 background_scripts 键：

{

  "manifest_version": 2,
  "name": "My Login",
  "version": "3.0",

  "description": "Login to my page",
  "homepage_url": "https://localhost",
  "icons": {
    "48": "icons/button-1.png"
  },
  "background": {
    "scripts": ["background.js"]
  }
}