You can see the client side code but what Pocket is doing with all the data on the server side is completely opaque and source is unavailable.
You can see the client side code but what Pocket is doing with all the data on the server side is completely opaque and source is unavailable.
This is no different from search integration. There's local code that lets you do Google/Yahoo/etc searches from the home page or the awesomebar. What these sites do with your data on the server side is unknown.
Bundling Pocket outright, like Mozilla was just another Silicon Valley company, was very shortsighted.
Also, I would not particularly call those search engines a great comparison. They are simply keyworded bookmarks - you set the URL and when you enter a character or click the icon it loads the bookmark. The extent of integration was the search options menu where you can add any website's search field and it inherits the icon from that website, so its generic.
And you can build a pretty accurate profile of a user from analyzing the content people mark to "read later" (and how long they spend reading them).