This add-on is available for Firefox, Chrome and Safari (and allegedly all other browsers) and allows you to switch between character sets on websites. Note that the conversion is of course automatic, so while it's useful and will work most of the time, it can't possibly get everything right. Converting from traditional to simplified ought to be much easier than the other way around, considering the large amounts of many to one mappings between traditional and simplified Chinese.
New Tong Wen Tang 新同文堂 (Character conversion of websites in most browsers)
Submitted by Olle Linge on 18 June, 2014 04:31
Beginner Intermediate Advanced Reading Web Simplified-Characters Traditional-Characters Tools-and-Apps