This sounds like FUD. The whole point of a (modern) browser is in essence a sandbox to safely run other peoples code. If you've ever visited a website, then yo

This sounds like FUD. The whole point of a (modern) browser is in essence a sandbox to safely run other peoples code. If you've ever visited a website, then you've given it permission to "install" arbitrary code from arbitrary sources. They're installed "in" the application (i.e. - its cache). Who cares? In fact, visiting a website is considerably worse. The code may be quite large, and it's not vetted in any way (unlike the pocket plugin), so it might try to escape the sandbox. If you're going to get fed up about this, at least have some reasonable basis for that. You might complain about the increased download size or disk usage (but the overhead is likely to be ridiculously small). You might complain about the attention pocket - a non free service - gets this way. Of course, this isn't too different from a default search engine. And did you know about https://activations.cdn.mozilla.net/en-US/ https://activations.cdn.mozilla.net/en-US/? At the end of the day, is your feeling based on anything other than a grumpy gut?