This lets me feel that unsafeWindow is actually safer in terms of not being detected (because the js contexts are isolated), as long as you don't go modifying anything (and especially DON'T expose privileged GM_* functions to unsafeWindow). Neither in none mode or unsafeWindow mode (provided you didn't leak anything to the page)

I'm also assuming that there's no leak of special functions, objects, properties, etc (such as GM_info to the webpage which would betray the existence of tampermonkey?). How are scripts injected into the page? Is it possible that the webpage can notice the userscript injection (assuming the userscript modifies NOTHING on the page).įor example, if a script was injected using a script tag, I think the page could possibly notice the script injection, even get a look at its code?ĭoes the sandbox model have any role in the way this happens, and make it 'safer' to not be seen? For example, if the js contexts are isolated if you use unsafeWindow, then perhaps the js on the webpage can't even see any userscript load event, making unsafeWindow fundamentally safer, UNLESS you go modifying the DOM or unsafeWindow of course.

The reason it is unsafe is not because of being detected or not, but because you are able to potentially give the untrusted page access to privileged GM_* functions in this mode, (which are not granted in regular mode, which means that GM_* for any function will isolate the js context, and you'll lose access to the page's js context unless you unsafeWindow) Second unsafeWindow.foo = 'bar' ) will still be detectable. Obviously, any changes you make to the DOM or page js context (e.g. document returns the regular page document rather than you needing to say unsafeWindow.document. You will have regular access to the DOM, e.g. My understanding is, if you use unsafeWindow, your script will be isolated in its own js context, anything you do to window will NOT be seen by the webpage, BUT you can access the webpage and javascript through unsafeWindow. IF you make any changes to the javascript and/or DOM, it is possibly detectable by the page. Second, how scripts are injected into the page, and can the page detect it? Firstįrom what I can see, when you use none, the sandbox is disabled and you will have access to the webpage and its javascript. First, how the sandbox model works, how it impacts the userscript, what is accessible / seen from the webpage and userscript point of view, and if using a different sandbox model affects the page being able to notice your script being injected into the page (or not).

Is tampermonkey chrome extension safe