Absolutely! Pale Moon is based on the Firefox source code that has a large community of developers and security-aware people, next to having seen over a decade of development by now. In addition, the Pale Moon team checks and verifies any reports of issues that might impact your safety on the web.
It includes, among other things:
- protection against dangerous add-ons
- protection against scam sites
- automatic checking for updates of add-ons
- anti-phishing
- anti-malware
- password protection/encryption (master password)
- website-identity information in the address bar
- private browsing