When the user is executing JS expressions in the command line they should be evaluated in the right context selected in the Context Selector.

Honza

Backed out for dt failures on browser_toolbox_remoteness_change.js.

Push with failures: https://treeherder.mozilla.org/#/jobs?repo=autoland&group_state=expanded&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&revision=8f9a32288d2cfa06a26b3368c5df2b48541e5c54&searchStr=%28dt&selectedJob=290649316

Failure log: https://treeherder.mozilla.org/logviewer.html#?job_id=290647706&repo=autoland

Backout link: https://hg.mozilla.org/integration/autoland/rev/214b1d66b3bc5b9dafa864f85e7835ccddfec18d

[task 2020-02-26T21:57:39.783Z] 21:57:39 INFO - TEST-PASS | devtools/client/framework/test/browser_toolbox_remoteness_change.js | Navigated to a data: URI and switching to remote -
[task 2020-02-26T21:57:39.783Z] 21:57:39 INFO - Waiting for the toolbox to be switched to the new target
[task 2020-02-26T21:57:39.783Z] 21:57:39 INFO - Veryify we are inspecting the new document
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - Buffered messages finished
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - TEST-UNEXPECTED-FAIL | devtools/client/framework/test/browser_toolbox_remoteness_change.js | The console inspects the second document -
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - Stack trace:
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - chrome://mochikit/content/browser-test.js:test_ok:1292
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - chrome://mochitests/content/browser/devtools/client/framework/test/browser_toolbox_remoteness_change.js:navigateBetweenProcesses:83
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - chrome://mochitests/content/browser/devtools/client/framework/test/browser_toolbox_remoteness_change.js:null:14
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - chrome://mochikit/content/browser-test.js:Tester_execTest/<:1062
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1097
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - chrome://mochikit/content/browser-test.js:nextTest/<:925
[task 2020-02-26T21:57:39.784Z] 21:57:39 INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<:914
[task 2020-02-26T21:57:40.996Z] 21:57:40 INFO - TEST-PASS | devtools/client/framework/test/browser_toolbox_remoteness_change.js | The client is closed after closing the toolbox -

https://hg.mozilla.org/mozilla-central/rev/7c51e4549c45