Are you sure you want to go to an external site to donate a monetary value?
WARNING: Some countries laws may supersede the payment processors policy such as the GDPR and PayPal. While it is highly appreciated to donate, please check with your countries privacy and identity laws regarding privacy of information first. Use at your utmost discretion.
Re: @r-a-y:
I think extending this site to support CSS would be a great option, rather than a separate site. "OpenUserJS" might be a slight misnomer in that case, although an "install as userscript" option would be useful to have as well, just like userstyles.org has.