[rooted]

Very slick! Does it automatically start OCRing every image, or does it wait for a user to try to select the image text? Asking because I'm concerned about this decreasing performance.

[antimatter15]

It waits until you start selecting the image text, but the text detection starts when your cursor moves toward an image. It uses WebWorkers extensively, so on a multicore system, the performance shouldn't be hit. I haven't noticed an effect on battery life, but that's not out of the question.