When creating a <browser remote=true> element and injecting it, the constructor tries to initialize session history without having a docShell. As this is used by the background thumbnailing service this errors appears quite regularly.

Comment on attachment 787973 [details] [diff] [review] Remote browser constructors shouldn't try to initialize session history I wonder if this.isRemoteBrowser should be used to better convey the intention?

Comment on attachment 787973 [details] [diff] [review] Remote browser constructors shouldn't try to initialize session history Review of attachment 787973 [details] [diff] [review]: ----------------------------------------------------------------- I think (though not certain yet) that we might remove the isRemoteBrowser in the future (because everything related to a remote browser should be in remote-browser.xml), so using docShell here is fine

One thing I was curious about was how session history works in remote browsers, if it isn't set up here. Anyone know? :)