Something changed in the Gentoo /usr/bin/firefox script and parsing URLs with spaces in the file name fails to escape the spaces and opens all sort tabs while trying to resolve/search for each part of the URL string.
Using /usr/lib64/firefox/firefox seems to parse the path correctly (when called from a local firefox.desktop file). This looks like a bug to me, but have you noticed something similar with Firefox 68.6.0-r3?
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