this is probably going to be a tracking bug, as problems are turning out to be multifaceted.

I have an addon with the following code set to run in a Nightly profile with e10s set to autostart: var tabs = require("sdk/tabs"); var timers = require("sdk/timers"); timers.setTimeout(openandattachtab, 5000); function openandattachtab() { var mytab = tabs.open({ url: "https://mozilla.org", onReady: function onReady(tab) { tab.attach({ contentScriptFile: "./testtabattach.js" }); } }); } And the contentScriptFile contains the following: console.log("Hello"); When this runs, after the five second timer finishes, I see the tab open to mozilla.org, and then see the following errors in the error console: Object { , 5 more… } runner.js:190 Object { , 5 more… } Promise-backend.js:869 Exception { message: "Failure arg 0 [nsIScriptSecurityManager.isSystemPrincipal]", result: 2147500037, name: "NS_ERROR_FAILURE", filename: "resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/content/sandbox.js", lineNumber: 122, columnNumber: 0, inner: null, data: null, stack: "WorkerSandbox@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/content/sandbox.js:122:28 constructor@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/core/heritage.js:145:22 @resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/content/worker.js:142:24 dispatch@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/method/core.js:119:11 WorkerConstructor@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/content/worker.js:74:6 constructor@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/core/heritage.js:145:22 Worker@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/tabs/worker.js:11:15 attach@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/tabs/tab-firefox.js:233:11 onReady@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://jid1-iyle96cenkklww-at-jetpack/teste10stabs/lib/main.js:10:0 _emitOnObject@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/deprecated/events.js:153:8 _emit@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/deprecated/events.js:123:11 TabTrait<._onContentEvent@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/kwier_000/Documents/GitHub/testprof/extensions/jid0-0NFSD4EANlyZsTb5kNJ5XqpIdeE@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/tabs/tab-firefox.js:111:4 ", location: XPCWrappedNative_NoHelper } events.js:147 "Hello" never gets logged to the console. Is there some issue with tab.attach in e10s windows?

(In reply to Wes Kocher (:KWierso) from comment #1) > Is there some issue with tab.attach in e10s windows? yes, the loader/sandbox module, and everything that depends on it (ContentWorker, PageMod, tab.attach..) is incompatible with e10s, i'm working on that in bug 1028718..

All the dependencies have been closed, can we close this?