If you are using Google Chrome, there are a number of things you can do to make your web browsing easier and more comfortable. For example, Chrome has in-built settings for Low Vision Support, Keyboard Access, Touch Access and Assistive Technology Support.
You can find more accessibility settings for Google Chrome here.
If you are using Apple's Safari browser you can customise your viewing experience by using it's Voice Over feature, change settings if you are deaf or hard of hearing and utilise tools if you have limited physical or motor skills.
You can find a more complete list of Safari's accessibility settings here.
Internet Explorer has a number of useful features to make browsing more accessible, such as the ability to zoom in on web pages, changing fonts and text formatting, changing colours, and voice over and screen reader options.
These settings and more can be found on Microsoft's accessibility support page here.