OS X 10.9.5
When did this happen? I haven't performed any system updates that could account for this suddenly being a thing. Did Apple sneak this on me/us*?
It occurs whenever I open a newly-installed/downloaded app. It leads up to the Gatekeeper dialogue's appearance.
*Perils of the internet: if I say, "me", I'm paranoid; if I say, "us", I'm scaremongering and/or exaggerating.
When did this happen? I haven't performed any system updates that could account for this suddenly being a thing. Did Apple sneak this on me/us*?

It occurs whenever I open a newly-installed/downloaded app. It leads up to the Gatekeeper dialogue's appearance.
*Perils of the internet: if I say, "me", I'm paranoid; if I say, "us", I'm scaremongering and/or exaggerating.