firefox-esr stopped working after June 18 update

[HLing]

It's been a while, and now I come back feeling like I missed a bunch of important events.  My own fault for not able to hang around as often.  Am I the only person affected because I'm still on 5.10? I  get an error message is i try to go anywhere beyond the welcome page when I start Firefox-ESR:Your connection is not secure(skipping a bunch).......error code: NS_ERROR_NET_INADEQUATE_SECURITY

[ryo]

As per: https://blog.kanbanmart.com/entry/firefox_error_http2

1. Go to "about:config".
2. Accept the warning.
3. Search for "network.http.spdy.enabled.http2".
4. Set the value to "false".

That worked on my end, as I got the same error.

[HLing]

As per: https://blog.kanbanmart.com/entry/firefox_error_http2

1. Go to "about:config".
2. Accept the warning.
3. Search for "network.http.spdy.enabled.http2".
4. Set the value to "false".

That worked on my end, as I got the same error.

wow!  That worked! Thank you, ryo!

[dukla2000]

It's been a while, and now I come back feeling like I missed a bunch of important events.  My own fault for not able to hang around as often.  Am I the only person affected because I'm still on 5.10? I  get an error message is i try to go anywhere beyond the welcome page when I start Firefox-ESR:Your connection is not secure(skipping a bunch).......error code: NS_ERROR_NET_INADEQUATE_SECURITY

Yeah I got this as well. Avoided the problem by swapping to full-strength Firefox (instead of -ESR) before I saw @ryo fix.

[henrythemouse]

The fix does allow me to load pages, but firefox is still displaying a yellow triangle over the lock, which is stating something about 'encryption' I think. It's way too small for me to read. In addition I've had more failures loading pages when clicking on a link in a page that did load. Not sure what it's all about and why firefox would have these problems. The desktop firefox and the android firefox are not affected. Chromium doesn't have this issue and neither does cog (which works very well on the pine phone with CogWebRun).

I'd like to get a hold of the latest firefox arm64 and give that a try, does anyone have a download link?

[dante404]

The fix does allow me to load pages, but firefox is still displaying a yellow triangle over the lock, which is stating something about 'encryption' I think.

I had the same problem, used the fix mentioned above, but I'm also bothered by this 'warning' icon. The question is: Is it a real problem with encryption or something we can safely ignore?

Didn't find anything about a known bug in Firefox ESR (I also don't have this problem on my regular Firefox on Desktop Linux)...

[ryo]

The fix does allow me to load pages, but firefox is still displaying a yellow triangle over the lock, which is stating something about 'encryption' I think. It's way too small for me to read. In addition I've had more failures loading pages when clicking on a link in a page that did load. Not sure what it's all about and why firefox would have these problems. The desktop firefox and the android firefox are not affected. Chromium doesn't have this issue and neither does cog (which works very well on the pine phone with CogWebRun).

I'd like to get a hold of the latest firefox arm64 and give that a try, does anyone have a download link?

I had the same problem, used the fix mentioned above, but I'm also bothered by this 'warning' icon. The question is: Is it a real problem with encryption or something we can safely ignore?

Didn't find anything about a known bug in Firefox ESR (I also don't have this problem on my regular Firefox on Desktop Linux)...

Warning: technical talk.
Apparently, Firefox ESR seems to want to push the HTTP/2 protocol in a similar way as how Mozilla and Google pushed HTTPS a few years ago.
The HTTP/2 protocol must be enabled in the web server software itself (which is literally 1 extra keyword in nginx, not sure about Apache).
I have confirmed it with 1 website I know has HTTP/2 enabled, and the warning triangle didn't appear.
This is why a warning triangle appears even on HTTPS websites if the server administrator didn't enable HTTP/2 (yet).

[dukla2000]

...
I'd like to get a hold of the latest firefox arm64 and give that a try, does anyone have a download link?

If you add the sid repository you can install it via apt.

EDIT/UPDATE

Having installed full Firefox, you can regain the benefit of the pmOS mobile/phosh stylesheets by
1) copy the chrome directory and contents from your old -ESR profile in ~/.mozilla/firefox/ to the new profile directory (can see new/old based on timestamps)
2) in firefox goto about:config
3) set toolkit.legacyUserProfileCustomizations.stylesheets to true
4) restart firefox

[dante404]

Warning: technical talk.
Apparently, Firefox ESR seems to want to push the HTTP/2 protocol in a similar way as how Mozilla and Google pushed HTTPS a few years ago.
The HTTP/2 protocol must be enabled in the web server software itself (which is literally 1 extra keyword in nginx, not sure about Apache).
I have confirmed it with 1 website I know has HTTP/2 enabled, and the warning triangle didn't appear.
This is why a warning triangle appears even on HTTPS websites if the server administrator didn't enable HTTP/2 (yet).

OK, thanks for clarfication!

What really confuses me is that Mozilla implements this new (game braking) change in the ESR version (before the regular one)... I always thought of ESR as the more stable and better tested, 'conservative' FF version (which lacks probably new features).

[ryo]

@dante404
I'd rather consider Pale Moon to be the 'conservative FF version', considering it's the only Firefox fork as far as I know that refuses to make its interface more like Chromium.