In 2017 Mozilla silently installed an extension promoting the TV show in everyone's Firefox.

The extension did not do anything unless you put in a secret setting. It wasn't promoting anything.

If this had been a hardcoded easter egg there would have been no real complaints. But showing up as a mystery extension spooked some people, and then misreporting made it spread a lot further than if all the reporting was accurate.

I just rewatched Mr Robot and that actually sounds cool. What was the secret setting ?

Once you get the extension installed, you open up about:config and add a boolean preference "extensions.pug.lookingglass" set to true.

There might have been another way to do it later but we'll never know.

Interesting. What did that accomplish ?

Adds an effect to certain words on websites (like puppet, control, economy, robot), sends an extra header to red-wheelbarrow.com that changes what you see.

https://github.com/mozilla/addon-wr/blob/master/addon/backgr...