Firefox broken, can't load pages

Schwim

New Member
Hi there!

Pixel 3a XL
Android 11 build RP1A.200720.009
Adguard 3.5(63)
Firefox 81.1.1

I am unable to load most pages in Firefox.
......
Secure Connection Failed

  • This could be a problem with the server’s configuration, or it could be someone trying to impersonate the server.
  • If you have connected to this server successfully in the past, the error may be temporary, and you can try again later.

Suspecting it's an issue with certificate, I tried to follow the following kb article:

But it fails. About:config redirects to resource://android/assets/low_and_medium_risk_error_pages.html?&title=Cannot+Complete+Request&button=Try+Again&description=%3Cp%3EAdditional+information+about+this+problem+or+error+is+currently+unavailable.%3C%2Fp%3E&image=&showSSL=false&badCertAdvanced=Advanced%E2%80%A6&badCertTechInfo=%3Clabel%3ESomeone+could+be+trying+to+impersonate+the+site+and+you+should+not+continue.%3C%2Flabel%3E+%3Cbr%3E%3Cbr%3E+%3Clabel%3EWebsites+prove+their+identity+via+certificates.+Firefox+does+not+trust+%3Cb%3Eabout%3Aconfig%3C%2Fb%3E+because+its+certificate+issuer+is+unknown%2C+the+certificate+is+self-signed%2C+or+the+server+is+not+sending+the+correct+intermediate+certificates.%3C%2Flabel%3E&badCertGoBack=Go+Back+%28Recommended%29&badCertAcceptTemporary=Accept+the+Risk+and+Continue

Which is just like one huge error packed into a url.

I've tried uninstalling and reinstalling firefox but the issue persists. Could someone tell me what I need to do to get Firefox working again?

Thanks for your time!
 

Schwim

New Member
I have googled and tried everything, including setting everything up on another phone I have(pixel 3 instead of 3a xl) and the issue persists even on the new phone. Secure connection failed and following the kb article on the Adguard site fails because about:config can not be reached.
 

Boo Berry

Moderator + Beta Tester
Moderator
You have to either downgrade Firefox to an old version (e.g. Firefox 68) and install the certificate there then upgrade back to Firefox 81 or use Firefox beta or Firefox nightly as Firefox stable doesn't currently allow installing of certificates.
 

Schwim

New Member
You have to either downgrade Firefox to an old version (e.g. Firefox 68) and install the certificate there then upgrade back to Firefox 81 or use Firefox beta or Firefox nightly as Firefox stable doesn't currently allow installing of certificates.
Thanks so much, upgrading to beta solved the issue!
 

d0x

Active Member
Well that's weird because I had the Firefox nightly installed and it worked fine for months until one day it stopped and started behaving like regular Firefox (telling me everything was unsafe)

So I already had the cert installed and the app working but they updated the app and broke it so how would I get it working again?

*Edit,. Got main version of Firefox working*
 
Last edited:

danielson

New Member
Same issue with Nightly here.
Have also tried stable and beta, it's a no go.
With no options in Adguard, must remove if i want to keep Firefox.
Why only Firefox and not Opera, Vivaldi or Brave?
 

danielson

New Member
Well, if it's of any "consolation" to you.
Just installed Firefox stable version (again) and it is still not going anywhere.
"Secure connection failed".
Never did that before.
 

Boo Berry

Moderator + Beta Tester
Moderator
It's because Firefox stable currently doesn't allow the installation of third-party certificates (which is needed to filter HTTPS), like AdGuard for Android's certificate, since they switched to their new Fenix-based build of Firefox. Otherwise you'll encounter those secure connection failed errors.

There's only two ways around it;

1) Downgrade to Firefox 68, install AG for Android's certificate into Firefox then update Firefox to the latest stable version. The certificate is carried over to the new Firefox (thankfully) when updating back to the Fenix-based Firefox version.

2) Switch to Firefox beta or Firefox nightly, which allows third-party certificates to be installed.
 

danielson

New Member
So, first step is to downgrade to 68 then "upgrade" to stable, beta or nightly?

Click, click, click....

Btw, where do we go on Google Play to download Firefox 68?
 
Last edited:

Boo Berry

Moderator + Beta Tester
Moderator
You have to downgrade Firefox and start it, install the certificate (go to http://local.adguard.com/cert in Firefox to install it when it prompts) then upgrade Firefox to the latest stable version. Unfortunately you can't download it from the Play Store, you have to download the APK and manually install (sideload) it. There's also a chance the newer Firefox profile won't work well (if at all) with an older Firefox build, so keep that in mind. You can download it from a site like APKMirror, e.g. https://www.apkmirror.com/apk/mozilla/firefox/firefox-68-11-0-release/

The alternative is switching to Firefox beta, which is what I'd recommend since it's easier, but it's a beta, so there *may* be issues, but it does allow for certificates to be installed (after toggling a setting in Firefox's about:config section).
 

danielson

New Member
Technology is weird!
Earlier this a.m., tried to get into GMail with Firefox and it would not work but did work via Vivaldi.
Go figure!

Did try Firefox beta but must give it explicit permission for every site.
 
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