Hi, When adding arguments to specify the path to the firefox profile, you need to specify -profile and path/to/profile separated by commas, otherwise the profile does not open. I also tried -profile=path/to/profile and --profile=path/to/profile, but this does not open the profile, so the only option that works for firefox, I have this firefox_arg='-profile,path/to/profile', but since in the same way, when checking firefox_arg_item, prefix '--' is added to the beginning of the path, which is why firefox cannot find the folder, the result is the string '--path/to/profile' because of this, I suggest checking that the string is the path and not adding prefix '--'