jquery - Chrome extension add button to site -


i'm trying simplest thing ever , won't work. i'm literally trying add button every tweet, now, later capture , send offiste when clicked. have , won't work, it's i'm failing hello world.

manifest.json 

{   "name": "tweep",   "author": "fisher",   "manifest_version": 2,   "version": "1",   "icons": { "16": "logo.png",            "48": "logo.png",           "128": "logo.png" },   "content_scripts": [     {       "run_at": "document_end",       "js": ["jquery.js", "addbutton.js"],       "matches": ["https://twitter.com/*"]      }   ] }

addbutton.js

$( ".profiletweet-actionlist u-cf js-actions" ).append( "<p>test</p>" );

here's funny part. chrome output 2 errors when load extension

uncaught typeerror: document.getelementsbyclassname(...)append... uncaught referenceerror: $ not defined

it throw these errors pretty whatever write, however, if add alert("boom"); addbutton.js, execute.

make sure include jquery library. not loaded.

in case do, make sure include before use of jquery object.

it might using other libraries interfere, can check , edit question please?


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