Question

when i finish my chrome extension i find an error it is:

 Uncaught TypeError: Cannot call method 'create' of undefined chrome-extension://dpfgkakomehcgdcnigflmkcfngeaamlc/js/background.js:46

injectScript startLiveReload init

i use it is this

mainfest.json “background”: {
“scripts”: [“js/background.js”] }

and background.js like

var readMenuItemId = chrome.contextMenus.create({
  "title" : "阅读模式",
  "type" : "normal",
  contexts : [ "selection" ],
  documentUrlPatterns: ["http://*/*", "https://*/*"],
  "onclick" : genericOnClick
});

i do not know where is wrong

Answer 1

You need to add permission contextMenus in manifest file in order to use this object:

"permissions": [
    "contextMenus"
],