Convert words between English and German using dict.leo.org.
Allows one to use dict.leo.org to translate a word on a webpage by selecting it, right-clicking it, then clicking 'Search dict.leo.org'.
The first search opens a new tab, and searches for the selected word in dict.leo.org. All subsequent searches use the same tab. This means that one can have a dict.leo.org tab open alongside another web page and quickly translate words while reading through it.
See the code here: https://github.com/wclear/GermanEnglishWordTranslatorExtension