User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b3pre) Gecko/20081221 Shiretoko/3.1b3pre Firefox/3.0.4 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b3pre) Gecko/20081221 Shiretoko/3.1b3pre Right clicking and dragging the cursor out of the area in a new window produces an abnormally long context menu. Reproducible: Always Steps to Reproduce: 1. Open a new Window. 2. Hold Right Click and drag the cursor out of the content area. 3. Release Right Click. Actual Results: A Context Menu with every context option is displayed. Expected Results: The correct context menu for the particular area should have been displayed. This error also produces a console entry. Error: this.target.ownerDocument is null Source file: chrome://browser/content/nsContextMenu.js Line: 531 Right Clicking into the the content area without dragging the cursor out of the area produces the menu as normal. This was verified in a clean profile.

Confirmed, I see same, marking New: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2a1pre) Gecko/20081221 Minefield/3.2a1pre Firefox/3.0.4 ID:20081221111445

Dup of bug 425575? If so it has been around since the development of 3.0.x

It does seem to be the same as that bug. Though the method to reproduce is slightly different.