Offline pages (file:/// ...) do not appear to be considered by the extension.

I wish though to test my own pages under both conditions – with and without Java-Script – before I publish them. It is still not clear to me if this is a bug or just something that the author chose to do this way.
Please read the recommendation given by Didjo, further below. Dev tools is really all you need.

Good, but not as great as it could be:

The keyboard shortcut clashes with other add-ons, and cannot be changed

If a site uses JavaScript to disable the context menu, then the context menu cannot be used to turn JavaScript off

excellent

Great but doesn't work on local files

Worked immediately, thanks a ton!

One thing I would really appreciate, however, is being able to disable "by tab" while also setting it up to blacklist an entire site. If this is already possible and I'm not seeing how, I would be happy to bump up to 5.

it made me exist