I\'m viewing a webpage using Chrome. The original source does not include jQuery, but it\'d be really helpful to use some jQuery functions to inspect the DOM. It would be a pain
You should be able to run this in your JS console.
var jq = document.createElement('script');
jq.src = "/path/to/jQuery.min.js";
document.getElementsByTagName('head')[0].appendChild(jq);
jQuery.noConflict();
Alternatively you can copy the entire jQuery file into the console. Not the best option, but that would work too.
A third option is this plugin, jQueryify, I haven't used it myself, but looks promising.