Obfuscate wot Nino

This add-on change the font on a page to use the font Flow Circular.

It can be useful to take a screenshot of a page to show a design without showing the actual text.

Usage :
On any page, use the context menu (usually with a right-click) to obfuscate a page.
You can't remove the obfuscation without refreshing the page

Do not test it on addons.mozilla.org, extensions cannot modify the content of this site for security reasons.

Credits :
This extension is licensed under the GNU GPLv3.
Orignal idea by @maris@chaos.social.

The Flow Circular is made by Dan Ross under the SIL Open Font License.