Mined from test logs In addon-sdk/source/test/tabs/test-tab.js: https://hg.mozilla.org/projects/holly/file/50e197279ad5/addon-sdk/source/test/test-tab.js#l66 https://hg.mozilla.org/projects/holly/file/50e197279ad5/addon-sdk/source/test/test-tab.js#l71 https://hg.mozilla.org/projects/holly/file/50e197279ad5/addon-sdk/source/test/test-tab.js#l72 https://hg.mozilla.org/projects/holly/file/50e197279ad5/addon-sdk/source/test/test-tab.js#l77 https://hg.mozilla.org/projects/holly/file/50e197279ad5/addon-sdk/source/test/test-tab.js#l78 https://hg.mozilla.org/projects/holly/file/50e197279ad5/addon-sdk/source/test/test-tab.js#l83 function step2(url, assert) { tabs.open({ url: url, onReady: function(tab) { primaryTab = tab; let window = windowUtils.activeBrowserWindow.content; let matchedTab = getTabForWindow(window); assert.equal(matchedTab, tab, "We are able to find the tab with his content window object"); let timer = require("sdk/timers"); function waitForFrames() { let iframe = window.document.getElementById("iframe"); <-- causes unsafe CPOW usage warning if (!iframe) { timer.setTimeout(waitForFrames, 100); return; } iframeWin = iframe.contentWindow; <-- causes unsafe CPOW usage warning let subIframe = iframeWin.document.getElementById("sub-iframe"); <-- causes unsafe CPOW usage warning if (!subIframe) { timer.setTimeout(waitForFrames, 100); return; } let subIframeWin = subIframe.contentWindow; <-- causes unsafe CPOW usage warning let subSubIframe = subIframeWin.document.getElementById("sub-sub-iframe"); <-- causes unsafe CPOW usage warning if (!subSubIframe) { timer.setTimeout(waitForFrames, 100); return; } let subSubIframeWin = subSubIframe.contentWindow; <-- causes unsafe CPOW usage warning matchedTab = getTabForWindow(iframeWin); assert.equal(matchedTab, tab, "We are able to find the tab with an iframe window object"); matchedTab = getTabForWindow(subIframeWin); assert.equal(matchedTab, tab, "We are able to find the tab with a sub-iframe window object"); matchedTab = getTabForWindow(subSubIframeWin); assert.equal(matchedTab, tab, "We are able to find the tab with a sub-sub-iframe window object"); // Put our primary tab in the background and test again. // The onActivate listener will take us to step3. auxTab.activate(); } waitForFrames(); } }); }

This is test only.

Luca has fix believes

The cpows usage described in Comment 0 has been fixed by Bug 1171515 (which has been merge into mozilla-central as part of Bug 1179013). Nevertheless, in the meantime this test file has got a new single cpow usage which has been added by Bug 1179013, which means that I added the only cpow currently used in this test file :-( This cpow usage can be removed by the tests by using the message manager to retrieve the current value of the document.readyState, without using the CPOW. I'm attaching the patch that remove the cpow usage from this test, using the strategy described above.

Pushed to try: https://treeherder.mozilla.org/#/jobs?repo=try&revision=c058a8366249c3620e848bc265fde74671fef011

Pushed by ryanvm@gmail.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/3b4965bb11c0 Remove CPOW shim usage in SDK test-tab test related to tab.readyState. r=Mossop