1. URL without encoding.
menubarx://open/?xurl=https://google.com/&xwidth=300&xheight=100&xbar=1
2. URL with parameters needs encoding
menubarx://open/?xurl=https%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3Dtest%2Bmenubarx&xwidth=300&xheight=600&xbar=1
Example:
Before Encoding:
https://www.google.com/search?q=test+menubarx
After Encoding:
https%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3Dtest%2Bmenubarx
Encode test tools:
www.urlencoder.org