The TechDis Toolbox has information on plug ins for the most popular types of browser. Mozilla Firefox has a number of accessibility extensions that you can download to make browsing easier. These include Reader for Firefox, which removed all the clutter from the page which could cause distractions.
Text to Voice is another plug in which does exactly that – turns text on the screen into audio that you can listen to. It also has a video download plug in which means you can download content you have found and view it again on a mobile device or offline.
Examples of these can be seen in the video below.