[Bug 1487166] [NEW] "Add bookmark" stopped working (accessing existing bookmarks works flawlessly, though)

[Markus Ueberall]

Public bug reported:

Since a few days, trying to add a new bookmark now reproducibly leads to
the following on the console:

*************************
A coding exception was thrown and uncaught in a Task.

Full message: ReferenceError: aTask is not defined
Full stack: StarUI._doShowEditBookmarkPanel at chrome://treestyletab/content/bookmarksOverlayEditable.js line 51 > eval:4:9
StarUI.showEditBookmarkPopup<@chrome://browser/content/browser.js:5110:7
TaskImpl_run at resource://gre/modules/Task.jsm:314:40
TaskImpl_handleResultValue at resource://gre/modules/Task.jsm:393:7
TaskImpl_run at resource://gre/modules/Task.jsm:322:13
TaskImpl at resource://gre/modules/Task.jsm:275:3
createAsyncFunction/asyncFunction at resource://gre/modules/Task.jsm:249:14
PlacesCommandHook.bookmarkPage<@chrome://browser/content/browser.js:5337:1
TaskImpl_run at resource://gre/modules/Task.jsm:314:40
TaskImpl at resource://gre/modules/Task.jsm:275:3
createAsyncFunction/asyncFunction at resource://gre/modules/Task.jsm:249:14
PCH_bookmarkCurrentPage at chrome://browser/content/browser.js:5430:5
oncommand at chrome://browser/content/browser.xul:1:1

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Installed packages: firefox{,-locale-de,-locale-en,-locale-fr} 40.0+build4-0ubuntu0.14.04.4 (updated yesterday from the previous version, i.e., the problem is not necessarily tied to this very version).
sqlite3 does not complain about places.sqlite, closing down FF and "vacuuming" did not change anything, SQL dump looks good.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1487166

Title:
  "Add bookmark" stopped working (accessing existing bookmarks works
  flawlessly, though)

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