STR: 1. Install Shumway extension from http://www.areweflashyet.com/shumway/extension/firefox/shumway.xpi 2a. Select e10s 2b. Set dom.mozBrowserFramesEnabled boolean to `true` 3. http://www.areweflashyet.com/shumway/examples/external/externalinterface/external_interface_avm2.html The first bad revision is: changeset: 230178:8c11efebc455 user: André Reinald <areinald@mozilla.com> date: Sat Feb 21 13:06:34 2015 +0100 summary: Bug 1083344 - Tighten rules for Mac OS content process sandbox - "rules part". r=smichaud

re: STR, before step 3 Firefox must be restarted. Andre, do you have ideas why it's happening on 10.9.5 but not on 10.10?

It's likely the extension changes what's being done by the content process, which is now sandboxed. 10.9 and 10.10 don't do things exactly the same way, but it's reasonably similar to factor out in the same set of rules. I'd need relevant parts of /var/log/system.log when you do step 3, especially lines containing "plugin-container" or "sandbox".

(In reply to Yury Delendik (:yury) from comment #1) > re: STR, before step 3 Firefox must be restarted. > > Andre, do you have ideas why it's happening on 10.9.5 but not on 10.10? Yury, it's my turn to ask for info, as per comment 2. Can you reproduce on a current nightly after setting security.sandbox.content.level to 1 and restarting? If it reproduces, then please attach the relevant portion of the /var/log/system.log If it doesn't, then I believe we should close this bug.

(In reply to André Reinald from comment #3) > Can you reproduce on a current nightly after setting > security.sandbox.content.level to 1 and restarting? > If it reproduces, then please attach the relevant portion of the > /var/log/system.log > > If it doesn't, then I believe we should close this bug. Sorry. Updated to OSX 10.10.

Tested myself, STRs don't work any longer in 10.9.5 with sandbox enabled since last changes from bug 1083344. Closing.