1251864 - (twitching at startup) It's possible to accidentally click wrong tab in Page Info window, because it doesn't immediately adds all tabs

Status: NEW

(Firefox :: Page Info Window, defect)

Description

[arni2033]

Attachment: screenshot 1 - It's possible to accidentally click wrong tab in Page Info window.png

>>>   My Info:   Win7_64, Nightly 47, 32bit, ID 20160225030209
STR:
1. Open  http://www.rp-online.de/
2. Click Identity block -> "More Information" (or Menu bar -> Tools -> Page Info)
3. Hover mouse over "Permissions" tab in less than 1 seconds.
4. Wait random amount of time (from 0s to 1s), then click

AR:
 Page Info has a noticeable delay (~2s) between opening the window and showing all tabs
 Therefore it's really possible to click wrong tab:
 After Step 3 there's no "Media" tab (see screenshot), so it may seem that if I click
 "Permissions" tab, it will open. NOPE. "Media" tab may be added at the same moment,
 so it will be selected instead of desired tab.

ER:  
 No random elements should be added under mouse pointer 0.1 second before I click

Note:
 Read bug 1238637, which is the similar bug. Currently it seems that
 Firefox developers just want me to click random buttons THEY want me to click,
 not the ones I hover, because they Wontfix'ed bug 1238637.