firefox --class company profile

check the class:

$ xprop
[...]
WM_CLASS(STRING) = "Navigator", "FxMogic"

.desktop menu entry:

$ cat ~/.local/share/applications/menulibre-firefox-mogic.desktop
[Desktop Entry]
Version=1.1
Type=Application
Name=Firefox Mogic
Comment=Firefox with Mogic company profile
Icon=firefox-symbolic
Exec=firefox -P mogic --class FxMogic %u
Actions=
Categories=WebBrowser;X-GNOME-WebApplications;
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;application/x-xpinstall;
StartupWMClass=FxMogic