WebVR supported, but no VRDisplays found, suddnly - webvr

When I develop webVr content using A-frame , web vr work probably with oculus rift using nightly browser (powered by firefox)
Then after 1 day I restart my computer , Then non of web vr experience work (developed by me or by other ) in nightly browser .
when i test using
https://webvr.info/samples/test-vr-links.html
The message "WebVR supported, but no VRDisplays found."
so i have problem i don't know where it .
->then I install firefox developer edition (it support web vr)
and I try test , it work probably then crash message from browser appears
so what can I do with this problem ? any solution ?
Note :
-I use web vr and I try it many times this problem doesn't appear
- all oculus experiences from store work
-actually I uninstalled and installed Nightly ,this step doesn't solve the problem .

Have you ever tried installing WebVR Emulation plugin in your Chrome Browser?
With the Emulation plugin, you don't even need the VR device like Oculus Rift, which kind of handy for development directly on desktop non-nightly browser.

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How do I troubleshoot Oculus in Firefox WebVR?

I'm currently using Oculus Rift + Touch in A-Frame (0.6.1). I haven't found any online forum on where to ask. I've tried using Firefox 55 (Which comes with WebVR), but it doesn't detect the Rift.
I can use Firefox Nightly, but it's very unstable, and it comes with different problems. My most recent one, is that the whole screen goes blank whenever I try to enter VR mode. The display is seen in the headset, and the app is able to work flawlessly. But I can't go back to Firefox and check the devtools (which is annoying).
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Tried checking this:
WebVR supported, but no VRDisplays found, suddnly
But it didn't help.
Check about:config in Firefox and make sure the VR flags are enabled (specifically the Oculus one). Sometimes it may be disabled for some reason.

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