If I “Inspect” a pop-up window/message box on chrome browser (by right clicking a web-page in chrome browser) there is a field called “Accessibility”. Under “Accessibility”, there are “GenericContainer” which has “list”. this list has a number of names as values (e.g. different type of pen). I would like to copy all values (names) of “list” and separate each value (names) by “;” when I click that pop-up/ message box using a Add-On in Chrome. How can I make that Add-On? I understand that I have to write javascript to execute with other .js file, for example, codes in this tutorial- https://markb.uk/building-a-simple-google-chrome-extension.html But I don’t know related function I need to call. Please keep it in your mind that I am new. Thanks in advance! PS: At least provide some tutorial, where I can find related instruction.