Thank you for looking into this. We did not have the issue with ESR FF 52 x32 
like we do now with FF 60 x64 but I have not tested on V52 with a clean/new 
profile like I have on V60.

On 7 Jun 2018, at 22:02, Mike Kaply 
<[email protected]<mailto:[email protected]>> wrote:

I've looked into this and I can't find any reason why setting checkloaduri to 
enabled would cause this behavior.

Is this a new behavior or did it happen on Firefox 52?

Mike

On Thu, Jun 7, 2018 at 10:58 AM, Samuel Ambaye 
<[email protected]<mailto:[email protected]>> wrote:
Hi,

Given Firefox 60 and that the following pref is added using about:config

capability.policy.localfilelinks.sites = 
http://www.example.com<http://www.example.com/>

When using an Identity Provider initiated SAML sign-in (on 
www.example.com<http://www.example.com/>)
The system somehow changes a SAML HTTP method POST to method GET causing the 
signing to fail.

Work-Around: Set browser.tabs.remote.autostart to false.

Notes: Apparently, others have reproduced this issue on other other sites 
(Salesforce) and when using other Identity Providers (GSuite).

My questions are:

  *   Is capability.policy.localfilelinks.sites a supported configuration?
  *   Is this just a bug or is there a trade off between the preference and the 
work-around.
  *   Any other / better work-arounds?

Any advice other than filing a bug report and disabling autostart?

Best,
Samuel

PS - The preference is used with the ones below

  *   capability.policy.localfilelinks.checkloaduri.enabled and
  *   capability.policy.policynames

PSS - No issue in Chrome, which does not offer access to the local file system 
anyway due to security conerns.


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