If you’ve played w/ Chrome extensions at all, you know they are super powerful. I recently wanted to visit a bunch of pages, and extract some info from each page. I could easily run some jQuery script in the console of each page to do this, but I wanted a quick and easy way to do this. Creating a Chrome extension, that includes jQuery, to run locally is pretty simple. Below are the different files (5 of them) you’ll need (put these all in a single folder).

After creating these and adding your code, add to Chrome by going to Extensions > Load unpacked extension and choose your folder.

1: manifest.json

{
 "name": "Your Extension Name",
 "description": "This was easy",
 "version": "1.1",
 "background": {
 "scripts": [ "jquery-3.1.1.min.js","background.js","content.js"]
 },
 "permissions": [
 "tabs", "http://*/*", "https://*/*"
 ],
 "browser_action": {
 "default_title": "My Extension Title",
 "default_icon": "a-cool-logo.png"
 },
 "manifest_version": 1
}

2: jquery-3.1.1.min.js (get a copy from jquery.com)

3: a-cool-logo.png (16px x 16px)

4: background.js

chrome.browserAction.onClicked.addListener(function(tab) {
 chrome.extension.getBackgroundPage().console.log('your plugin gonna do something');
//maybe see if your plugin should be allowed to run
 if (tab.url.indexOf("/maybeCheckAurl/") !== -1) {
 
chrome.tabs.executeScript(null, { file: "jquery-3.1.1.min.js" }, function() {
 chrome.tabs.executeScript(null, { file: "content.js" });
});
 
 }
 
});

5: content.js (the magic happen here)

//i check to make sure jQuery is loaded
if (jQuery) { 
 
 jQuery(".someclass a").each( function() { 
 
//log the results 
 console.log($(this).attr("href"));

//maybe do something with them
 $.get( "http://yourapi"), function( data ) {});
 
 });
 
} else {
 alert('no jq');
}