The settings file (i.e. viewSource.xml) is wiped when I manually update the VSW extension.
1. remove ViewSourceWith 0.8.1.1 in the Add-ons Manager
2. restart browser
3. install ViewSourceWith 0.9.1.1 through the command line
i.e. firefox.exe "dafizilla_viewsourcewith-0.9.1.1-fx+tb.xpi"
The following message alerts even though the button is already on the toolbar.
"ViewSourceWith can be easier to use from a toolbar button, do you want to add it?"
Windows XP SP3