By adding the '?' prefix, the app is searched by its name instead of its
package name (it may take some time to retrieve the app names on the
device):
scrcpy --start-app=?firefox
An app matches if its label starts with the given name,
case-insensitive.
If '+' is also passed to force-stop the app before starting, then the
prefixes must be in that order:
scrcpy --start-app=+?firefox
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