Steps to reproduce: - open a new e10s window "A" - open the browser toolbox - set a breakpoint here: https://dxr.mozilla.org/mozilla-central/source/browser/base/content/tabbrowser.xml?from=tabbrowser.xml#5470 - switch tabs, nothing happens - open new e10s window "B" - close new e10s window "B" - switch tabs on window "A" again - -> breakpoint now triggers correctly This may not be e10s specific, but the breakpoint there is in code only executed in e10s windows. Expected: Breakpoint correctly triggers without having to open new e10s window

I can take a look at this later this week. Maybe it's something to do with our script store, and somehow opening the new window makes it load all the scripts into our debugger server or something?

This sounds potentially related to bug 1107656 where connecting to both an e10s window and browser toolbox at the time same time causes RDP message to get misrouted.

James, if this is indeed an E10s bug, then this is one I could use your help with! Let me know whether you'll be able to look into this.

I'll make this a priority since e10s is supposed to be uplifted in a couple weeks

I just tried it with the patch from bug 1107656 and it still happens. I'll dig around some more.

Super small patch. I don't think this was e10s related. We weren't marking inline scripts in XUL files as actually inline, which messed up how we handle source actors for them.

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