MathJax Bookmarklet is a bookmarklet for rendering Tex/LaTeX and MathML notation on pages dynamically using mathjax library.
Pages don't have to include mathjax.js. Library is included and configured dynamically. LaTeX preprocessor will render equations delimitated by "$", "$$", "\[" and "\]".
Minify the bookmarklet from bookmarklet.js by using uglifyjs bookmarklet.js -m. (with UglifyJS2)
Install the bookmarklet HERE.