This item is about launchers in the panel and the Xfce's Preferred Applications system configured with the exo-open command.
The windows which will be opened:

With a launcher a program can be started from the Panel. A new launcher is made by

• Right clicking in the panel
• Click on “Panel” in the context menu
• Click on “+ Add new items”
• Click on Launcher (the top item of the list)
• Click on the “+ Add” button on the bottom
• Close the window (by clicking on the close button)
• Right click on the new launcher item on the far right of the panel
• Click on properties
• Click the + button on the right side of the window

From here on we will discuss the addition of a webbrowser

• In the search box type “Web Browser”
• Click on the item “Web Browser” in the list
• Click on the “+ Add” button on the bottom
• Now in the Launcher window in the tab General the Web Browser has appeared
• Click on it
• Click on the edit icon in the icon list on the left side of the Launcher window, the button at the bottem of the list. Here the Name and Comment can be changed if desired.

xfce:exo:start (Xfce Docs)

The last item opens

which can also be opened via the Menu

Menu | Settings | Preferred Applications

Now we will discuss how to set the desired web browser to be launched by the exo-open command

exo-open - Open URLs and launch preferred applications (for Xfce)
The command to launch the web browser is

exo-open --launch WebBrowser %u

If more web browsers are installed it is not clear which one will be launched. This can be set via the configuration file

/etc/xdg/xfce4/helpers.rc

However, changing the settings with

exo-preferred-applications

does not change this file. We tried to find where the data set with exo-preferred-applications is stored. We searched with grep but were not able to find the configuration file. Also searching the Internet did not give any clues.
Also, changing the item WebBrowser in this file from

WebBrowser=debian-sensible-browser

to

WebBrowser=xlinks2

which is installed, does not have any effect.
If we search for a program

debian-sensible-browser

with

find / -type f -name debian-sensible-browser

if is not found. So it is not clear to us where debian-sensible-browser is called / located
So far it is not clear to us where the settings changed with

exo-preferred-applications

are stored

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