Firefox users recently noticed a strange new Looking Glass plug-in in their browsers over the past few days. Turns out, it was installed secretly as part of a marketing tie-in with Mr. Robot, designed as a “shared experience to further your immersion into the Mr Robot universe” that made minor changes to certain websites. After hearing complaints, Mozilla backpedaled and moved the plug-in to its app store. "Suffice to say, we've learned a good deal in the last 24 hours ... Although we always have the best intentions, not everything that we try works as we want," said Jascha Kaykas-Wolff, Mozilla's chief marketing officer.