You have two possibilities.
1) You can select these item, choose the modify button then (in the Action modification for the type : Internet...'s windows) go to select Liberkey\Apps\Chrome\
ChromeLKL.exe with the select button and replace the first line with
Open with Firefox (Liberkey) by
Open with Chrome (Liberkey);
2) It's also possible to directly click on
New... button, then go to select Liberkey\Apps\Chrome\ChromeLKL.exe with the
Search... button and click on
OK button.
Now, select Open with Google Chrome (Liberkey) then click
By default button ; check Replace the current action for these type of file and finally click on the
OK button.
You'll probably have to do these actions for .htm ; .html, etc... extensions and (http:) URL protocol for completely replace Firefox by Chrome .
Finally close the Files types associated to Liberkey portable applications' windows with a click on the
Apply Button, then close it with the
OK button.
Now you must have Chrome as default navigator.
JP4U