Eclipse is unable to open firefox developer edition in MX-Linux when the browser is open - eclipse

When I try to open a ".jsp" file from Eclipse into the firefox developer edition, the browser cannot load the page when it is open. Instead, it only displays the page when it is started.
In the picture below, you can see that I have set that browser as the default in Eclipse.
For confirmation, my firefox developer edition is saved in the /opt/firefox-dev/ directory. And also, in the properties, I have included the %u command.
I am using MX-Linux as my OS. So what can be the reason behind this behaviour?

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