This is just what I was looking for, this extension is amazing. All aside, I think that it can be improved further by two things, first the loading time until the result shows up is a little bit long, second, I would love the results to stay up when I switch to other tabs.

Wow! very helpful Addon! and gives a lot of information. I just selected/highlighted a word and I clicked on the extension button/icon on the top toolbar, and a popup window showed up explaining the word i chosen.
Also your website is very well designed and very helpful! 👍
* One suggestion: it would be perfect if when we Right-click our mouse on the selected word, the "context menu" will show up, and we click the icon from there as well.

Highlight a word and click the extension icon and voila: synonyms.
(Suggestion/wish: It would be easier to use with a right click context menu option.)

After enabling 'Auto check text' for a domain, I see no way to revert to manual.

After disabling for a domain, I see no way to re-enable.

Does not work with the editable field when writing a comment at GitHub.

Workaround:

1. switch from write mode to preview mode
2. re-select the previously selected text
3. reuse the extension
4. revert to write mode.

Tested with Waterfox 56.2.0.31 on FreeBSD-CURRENT.

Enhancement request:

- please make the extension work with the context menu for selected text.

(It's rarely good to _require_ use of the toolbar, or overflow menu.)

Thanks