Mozilla employee here. A donation to Mozilla Foundation can't be spent on Firefox development. So if you want to specifically help Firefox then yes, pocket or V

Mozilla employee here. A donation to Mozilla Foundation can't be spent on Firefox development. So if you want to specifically help Firefox then yes, pocket or VPN are the best ways to do that. It still won't go 100% towards Firefox development, but rather just in to the corporation's "pot", the majority of which is spent on Firefox development. (Donations to the foundation are kept separate, but are also spent on very worthwhile causes in my opinion.)