Set your BROWSER environment variable to the name of your browser. The details depend on your browser and type of shell. For example, if you are using Mozilla and bash, then put export BROWSER=mozilla in your ~/.bashrc file. When using a csh shell variant, put setenv BROWSER mozilla in your ~/.cshrc file.
The web links inside Geneious Prime don’t work under Linux
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From my experience, it Geneious opens Opera (why, when Firefox is set as default browser), but the web page is blank. I'll try the edit in .bashrc.