what was installed?

I was looking at a first tab on (on Firefox mobile on my nexus 4) when I saw the gray message box appear briefly at the bottom of my screen, telling me "installation complete". I'm wondering what was installed? the site apparently has an app but I didn't accept any installation and no new apps appear to be on my phone. I've also check Firefox for new add ons - none. Could this have just been a background installation of an update to an app I already have?

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