1366398 - TelemetryStopwatch: key "FX_TAB_SWITCH_TOTAL_MS" was already initialized

Status: RESOLVED WORKSFORME

(Firefox :: Tabbed Browser, defect)

Description

[Kamil Jozwiak [:kjozwiak]]

When moving tabs back into the main process window, you'll get the following error messages in the browser console every time:

TelemetryStopwatch: key "FX_TAB_SWITCH_TOTAL_MS" was already initialized  TelemetryStopwatch.jsm:282
  start resource://gre/modules/TelemetryStopwatch.jsm:282:7
  start resource://gre/modules/TelemetryStopwatch.jsm:136:12
  updateCurrentBrowser chrome://browser/content/tabbrowser.xml:1067:17
  onselect chrome://browser/content/browser.xul:1:44
  set_selectedIndex chrome://global/content/bindings/tabbox.xml:672:13
  set_selectedPanel chrome://global/content/bindings/tabbox.xml:691:13
  set_selectedIndex chrome://global/content/bindings/tabbox.xml:409:15
  set_selectedItem chrome://global/content/bindings/tabbox.xml:441:34
  set_selectedTab chrome://global/content/bindings/tabbox.xml:111:15
  set_selectedTab chrome://browser/content/tabbrowser.xml:3255:11
  _blurTab chrome://browser/content/tabbrowser.xml:2825:13
  _endRemoveTab chrome://browser/content/tabbrowser.xml:2689:13
  swapBrowsersAndCloseOther chrome://browser/content/tabbrowser.xml:2940:13
  adoptTab chrome://browser/content/tabbrowser.xml:3457:11
  onxbldrop chrome://browser/content/tabbrowser.xml:6676:11

TelemetryStopwatch: requesting elapsed time for nonexisting stopwatch. Histogram: "FX_TAB_SWITCH_TOTAL_MS", key: "null"  TelemetryStopwatch.jsm:297
  timeElapsed resource://gre/modules/TelemetryStopwatch.jsm:297:7
  finish resource://gre/modules/TelemetryStopwatch.jsm:315:17
  finish resource://gre/modules/TelemetryStopwatch.jsm:192:12
  onMozAfterPaint chrome://browser/content/tabbrowser.xml:1072:21

STR (example: https://youtu.be/w_3ydBg1po8)

* launch fx54.0b8 or fx53.0.2 (not reproducible under fx55.0a1)
* open the browser console via the Hamburger menu -> Developer -> Browser Console
* move a tab into a separate window and than move it back into the main window

Builds used:

* fx54.0b8, buildid: 20170515124824, changeset: 9bef2dfbd584 - Reproduced
* fx53.0.2, buildid: 20170504105526, changeset: f87a819106bd - Reproduced
* fx55.0a1, buildid: 20170519030205, changeset: 8e98dab5054d - Couldn't reproduce

Comment 1

[Georg Fritzsche [:gfritzsche]]

AFAIU this was previously fixed by bug 1261738.

Comment 2

[Dão Gottwald [:dao]]

I've removed this probe in bug 1446004.