1326575 - Popup blocker being bypassed on www.flixreel.club

Status: RESOLVED INVALID

(Firefox :: General, defect)

Description

[Windward]

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36
Build ID: 20161208153507

Steps to reproduce:

I suspect that this website is using clever JavaScript to bypass Firefox built-in pop-up blocker protection.  If I override the user-agent string in Firefox to spoof Chrome browser, popup blocker works as expected.   

Steps to reproduce pop-up:
1) Navigate to http://flixreel.club/episodes/westworld-1x7-trompe-loeil/ 
(Or any episode on the website)
2) Click the play button on the video / episode
3) A pop up should pop up.  




Actual results:

1) An annoying popup pops up on first click 
2) Watch video for a few minutes, and click ANYWHERE on screen and another popup will pop up 
3) Rinse, repeat 


Expected results:

Steps to fix the issue:
1) Go to About:Config page
2) Create a new string for "general.useragent.override" 
3) Set the value of the above key to spoof a Google Chrome User Agent: e.g. "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36"
4) Now revisit http://flixreel.club/episodes/westworld-1x7-trompe-loeil/ 
(Or any episode on the website)
5) Click the play button on the video / episode
6) VOILA!  Popup blocker works as expected.

Comment 1

[Mike Taylor [:miketaylr]]

This should probably live in Firefox::General before Tech Evangelism so someone who knows more about popup blocker issues can take a look.

Comment 2

[Johann Hofmann [:johannh]]

Not sure why the site does browser sniffing but opening popups from an event handler (such as onclick) is allowed in Firefox and not a bug. You can turn it off by removing the relevant events from "dom.popup_allowed_events" in about:config.