Copyfish is not the first Optical Character Recognition (OCR) extension, as Project Naptha already exists.
But the extension seems to extend functionality by adding new options that Project Naptha does not have.
Probably the biggest advantagecase Among the features that Copyfish has is that it enables you to select text from videos and PDF documents displayed in Chrome, Edge and Firefox, as well as text from images. It should be noted that Project Naptha limits its translation to images only.
The second new feature is instant translation. Imagine watching a video on YouTube which displays subtitles in a foreign language you do not understand. 
Using Copyfish you can watch the video with translated subtitles!
Copyfish adds an icon to the browser's address bar.
Note that the extension requires permission to read and change the data on all the websites you visit.
The icon appears in red or black, depending on whether you can use the OCR extension features on a page or not.
If the icon is red and you click on it, the extension will display an overlay on it screen and you and it will ask you to draw a rectangle around the text you want to translate.
The text automatically edits and opens an overlay in its lower right corner screen which displays the copied text as an image on top, and the translation below.
The latest version of the add-on also has a Screenshot Reader, for editing text on your desktop.
Copyfish is a useful extension and you can try it from the ink below
Copyfish OCR for Chrome
Copyfish OCR for Firefox
Copyfish OCR for Edge
Watch the video
