On the browser set up the shortcut key to have the easiest way keystroke of:

1. Reload without cache

2. Stop the load.

These usually default to control R and ESC key respectively

Make both to be control+K and control+,

or whatever you think the easiest or simplest operation as the two keys each is adjacent to other

Every time get into those kinds of web site:

1. Alert, then as soon as the text comes up, even long before any image is loaded, hit the key of stop the load, this most of the time would prevent the restricting Javascript to get loaded

2. If you're too late to succeed in doing such, then hit the key of reload and then repeat step 1