The plugin uses the algorithm from jsbeautifier.org to beautify javascript. It will only apply the beautification to content served with the mime types 'application/javascript', 'text/javascript' or 'application/x-javascript'. These content types can be changed by modifying the "extensions.jsdeminifier.contenttypes" preference. The plugin can be enabled and disabled for a tab by clicking on the JS
![Javascript Deminifier – Get this Extension for 🦊 Firefox (ja)](https://cdn-ak-scissors.b.st-hatena.com/image/square/beb0b860dd86e19a2e07fbff00caf52f8f036c5a/height=288;version=1;width=512/https%3A%2F%2Faddons.cdn.mozilla.net%2Fuser-media%2Fpreviews%2Ffull%2F50%2F50528.png%3Fmodified%3D1530208885)