Created attachment 805710 [details]
Bug screenshot

Description of problem:
In Firefox, clicking on the translation target shows resize handles around the textarea and displays two small navigation handles at the top of the screen.
Using these allows the user to resize and even hide the target textarea without being able to get it back until the document is reloaded.

Version-Release number of selected component (if applicable):
3.0

How reproducible:
Easy always

Steps to Reproduce:
1. Open a document (in firefox)
2. Click the target (see location of pointer in screenshot)
3. Move the handles or click the icons at the top of the screen (see circled in screenshot)

Actual results:
Resized / broken target textarea

Expected results:
These shouldn't appear

Additional info:
Apparently it's possible to disable these with
document.designMode = "on"; document.execCommand('enableObjectResizing', false, 'false');
or
_moz_resizing='false'