ProxyHub lets you send specific sites through a proxy instead of routing your whole browser through one.

Per-site rules with real wildcard support (e.g. *.example.com)
HTTP, HTTPS, SOCKS4, and SOCKS5 profiles, each with optional username/password
Nested CDN "companion group" suggestions, so proxied pages don't break missing assets
Optional encrypted credential vault — proxy passwords stay behind a master password instead of plain text
Searchable rule manager with JSON import/export
At-a-glance toolbar icon showing whether the current tab is proxied or direct

ProxyHub does not collect, transmit, or share any data. Profiles, rules, and (if used) the encrypted vault are stored only in your browser's local storage. Source code: https://github.com/Mirhajian/ProxyHub