Chrome extension JavaScripts are executed in their own hermetic environment (a "world"), which avoids potential issues arising from scripts and document JS trampling each other in the same scripting context.

We should investigate if we can use this capability, or some subset of it, for Frame script injection.
 

Chrome extension JavaScripts are executed in their own hermetic environments ("worlds"), which avoids potential issues arising when scripts and document JS trample each other in the same global context.

We should investigate if we can use this capability, or some subset of it, for Frame script injection.