The RDM touch simulation mode captures mouse events pretty well, and should be easy to use once Bug 1269882 has landed. However, it still triggers CSS :hover states, whereas this shouldn't be the case on a mobile device. [Steps to reproduce]: 1. Launch Firefox. 2. Enable the devtools.responsive.html.enabled pref, and restart Firefox if necessary 3. Open http://www.w3schools.com/cssref/tryit.asp?filename=trycss_sel_hover, or any website using CSS hover states 4. Launch RDM on this website 5. Move your mouse over elements using this to see how it looks 6. Now enable touch simulation. You might have to reload the iframe by calling reload() on it in the console. 7. Move your mouse over these elements again. [Expected result]: - The hover state doesn't trigger anymore. There should only be a visible change when you click on the link/element ("sticky" hover). [Actual result]: - The hover state is still triggered. We shouldn't be able to interact with the page this way.

Pushed by mtigley@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/106e58c798ef Don't allow RDM to show triggered hover states while touch is enabled. r=pbro