The script outputs HTML to stdout, redirect to a convenient file and open in your browser. Each bookmark presented as a link, which can be bookmarked in the normal manner. Here's an example of the output.
bmdiff -[arpdl] oldfile newfile > output.html
The following flags are permitted:
|a||Show added links.|
|r||Show removed links.|
|p||Show preserved links.|
|d||Show duplicate links.|
|l||Long format, includes bookmark locations.|
If no flags are specified, -ard is assumed.