Is your app that old that you cannot use SuperDevMode ? It exists since GWT 
2.5 which will soon be 10 years old ‼ with the first "really usable" 
version in GWT 2.7, nearly 8 years ago.
https://www.gwtproject.org/articles/superdevmode.html
Nobody nowadays still uses the "legacy devmode" with browser plugins.

On Friday, June 24, 2022 at 11:29:44 AM UTC+2 [email protected] wrote:

> I maintain the (old) application with the GWT part. To run the system 
> locally (bugs fixing or minor code changes) I need the FF26 - and the GWT 
> plugin.
> Each time I have to setup my machine for the task, I install the FF26 and 
> the GWT plugin. No problems in the past. But this year I get the error 
> while doing it:
>
> Secure Connection Failed
> An error occurred during a connection to www.gwtproject.org. Cannot 
> communicate securely with peer: no common encryption algorithm(s). (Error 
> code: ssl_error_no_cypher_overlap) 
>
> How can I install the GWT plugin on my FF26 browser?
>
> Thanks!
>

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