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https://issues.apache.org/jira/browse/GUACAMOLE-544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16438451#comment-16438451
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Nick Couchman commented on GUACAMOLE-544:
-----------------------------------------

It's definitely worth a look, but I'm not optimistic about the chances of this 
helping you out.  In most situations, the Guacamole web app already captures 
the right-clicks and prevents the browser context menu from showing - if 
something is configured in the browser that blocks this and shows the browser's 
context menu, instead, there's little that can be done inside the web app to 
change or prevent this behavior that's not already being done.  Ultimately the 
operating system and the browser have final say over what events are captured 
locally and what are ignored.

> Allow a way to right-click without browser context menu popping up
> ------------------------------------------------------------------
>
>                 Key: GUACAMOLE-544
>                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-544
>             Project: Guacamole
>          Issue Type: Improvement
>         Environment: Browser: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) 
> Gecko/20100101 Firefox/52.0
> Remote: CentOS Linux release 7.4.1708 (Core) 
>            Reporter: Kristian Bolino
>            Priority: Minor
>
> When using Apache Guacamole in Firefox on my corporate domain, and logged 
> into a remote session, when I right click the browser context menu pops up 
> and hides the remote session's context menu. I have to press ESC to clear it. 
> This is a hassle, albeit not a major one.
> Unfortunately, I cannot control this behavior. The Firefox configuration 
> property {{dom.event.contextmenu.enabled}} is set to _false_ and is locked by 
> policy. I was able to track down [this 
> page|https://www.stigviewer.com/stig/mozilla_firefox/2014-07-03/finding/V-15986]
>  which may explain the rationale. It is very unlikely that I would be able to 
> get this changed by corporate IT.
> I realize that there's probably nothing that can be done to directly address 
> this issue, but it would be nice if there was a configurable workaround for 
> it, like binding some mouse/key combination that doesn't trigger the browser 
> context menu to right-clicking on the remote session.



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