Using this add-on you can select a word or phrase on a web page to view it's definition/meaning.You can either...

1. Double click a word
2. Click and drag to select a phrase
3. Double tap on touch devices

Or click on the add-on icon in tool bar to enter a word manually.

This add-on is build according to WebExtensions specs. (docs)

There are a couple ways to try out the extension in this repository.

1. Open Firefox and load about:debugging in the URL bar. Click the Load Temporary Add-on button and select the manifest.json file within the directory of the extension you'd like to install. Here is a video that demonstrates how to do this.
2. Install the web-ext tool, change into the directory of the extension you'd like to install, and type web-ext run. This will launch Firefox and install the extension automatically. This tool gives you some additional development features such as automatic reloading.

To learn more about developing WebExtensions, see the WebExtensions documentation on MDN for getting started guides, tutorials, and full API reference docs.

If you find a problem, please file a bug.

Contributions are welcome, whether they are whole new features or bug fixes.

For an index of some example add-ons, see the "Example extensions" page on MDN.

Anatomy of a WebExtension