diff --git a/src/background/handlers/onBeforeVideoWeaverRequest.ts b/src/background/handlers/onBeforeVideoWeaverRequest.ts
index 9eba3c7..deec2f2 100644
--- a/src/background/handlers/onBeforeVideoWeaverRequest.ts
+++ b/src/background/handlers/onBeforeVideoWeaverRequest.ts
@@ -38,7 +38,7 @@ export default function onBeforeVideoWeaverRequest(
       textLower.includes("https://example.com") &&
       textLower.includes("https://help.twitch.tv/");
     const proxy =
-      details.proxyInfo && details.proxyInfo.type !== "direct"
+      details.proxyInfo && details.proxyInfo.type !== "DIRECT"
         ? getUrlFromProxyInfo(details.proxyInfo)
         : null;
 
diff --git a/src/background/handlers/onProxyRequest.ts b/src/background/handlers/onProxyRequest.ts
index 5dbaf5f..a27e60d 100644
--- a/src/background/handlers/onProxyRequest.ts
+++ b/src/background/handlers/onProxyRequest.ts
@@ -32,7 +32,7 @@ export default async function onProxyRequest(
   }
 
   const host = getHostFromUrl(details.url);
-  if (!host) return { type: "direct" };
+  if (!host) return { type: "DIRECT" };
 
   const documentHost = details.documentUrl
     ? getHostFromUrl(details.documentUrl)
@@ -43,7 +43,7 @@ export default async function onProxyRequest(
     !passportHostRegex.test(documentHost) && // Passport requests have a `passport.twitch.tv` document URL.
     !twitchTvHostRegex.test(documentHost)
   ) {
-    return { type: "direct" };
+    return { type: "DIRECT" };
   }
 
   const proxies = store.state.optimizedProxiesEnabled
@@ -92,12 +92,12 @@ export default async function onProxyRequest(
   if (proxyUsherRequest && usherHostRegex.test(host)) {
     if (details.url.includes("/vod/")) {
       console.log(`✋ '${details.url}' is a VOD manifest.`);
-      return { type: "direct" };
+      return { type: "DIRECT" };
     }
     const channelName = findChannelFromUsherUrl(details.url);
     if (isChannelWhitelisted(channelName)) {
       console.log(`✋ Channel '${channelName}' is whitelisted.`);
-      return { type: "direct" };
+      return { type: "DIRECT" };
     }
     console.log(
       `⌛ Proxying ${details.url} (${
@@ -119,7 +119,7 @@ export default async function onProxyRequest(
       findChannelFromTwitchTvUrl(tabUrl);
     if (isChannelWhitelisted(channelName)) {
       console.log(`✋ Channel '${channelName}' is whitelisted.`);
-      return { type: "direct" };
+      return { type: "DIRECT" };
     }
     console.log(
       `⌛ Proxying ${details.url} (${
@@ -149,12 +149,12 @@ export default async function onProxyRequest(
     return proxyInfoArray;
   }
 
-  return { type: "direct" };
+  return { type: "DIRECT" };
 }
 
 function getProxyInfoArrayFromUrls(urls: string[]): ProxyInfo[] {
   return [
     ...urls.map(getProxyInfoFromUrl),
-    { type: "direct" } as ProxyInfo, // Fallback to direct connection if all proxies fail.
+    { type: "DIRECT" } as ProxyInfo, // Fallback to direct connection if all proxies fail.
   ];
 }
diff --git a/src/background/handlers/onResponseStarted.ts b/src/background/handlers/onResponseStarted.ts
index a02b436..e188386 100644
--- a/src/background/handlers/onResponseStarted.ts
+++ b/src/background/handlers/onResponseStarted.ts
@@ -171,7 +171,7 @@ function getProxyFromDetails(
     return getUrlFromProxyInfo(possibleProxies[0]);
   } else {
     const proxyInfo = details.proxyInfo; // Firefox only.
-    if (!proxyInfo || proxyInfo.type === "direct") return null;
+    if (!proxyInfo || proxyInfo.type === "DIRECT") return null;
     return getUrlFromProxyInfo(proxyInfo);
   }
 }
diff --git a/src/common/ts/proxyInfo.ts b/src/common/ts/proxyInfo.ts
index a053a22..7f42552 100644
--- a/src/common/ts/proxyInfo.ts
+++ b/src/common/ts/proxyInfo.ts
@@ -1,9 +1,36 @@
 import { Address6 } from "ip-address";
 import type { ProxyInfo } from "../../types";
 
-export function getProxyInfoFromUrl(
-  url: string
-): ProxyInfo & { type: "http"; host: string; port: number } {
+export const proxySchemes = {
+  direct: "DIRECT",
+  http: "PROXY",
+  https: "HTTPS",
+  socks: "SOCKS",
+  socks4: "SOCKS4",
+  socks5: "SOCKS5",
+  quic: "QUIC",
+} as const;
+
+type Protocol = keyof typeof proxySchemes;
+
+const defaultPorts: Partial<{
+  [key in keyof typeof proxySchemes]: number;
+}> = {
+  http: 80,
+  https: 443,
+  socks: 1080,
+  socks4: 1080,
+  socks5: 1080,
+  quic: 443,
+};
+
+export function getProxyInfoFromUrl(url: string) {
+  let protocol = "";
+  if (url.includes("://")) {
+    const [_protocol, urlWithoutProtocol] = url.split("://");
+    protocol = _protocol;
+    url = urlWithoutProtocol;
+  }
   const lastIndexOfAt = url.lastIndexOf("@");
   const hostname = url.substring(lastIndexOfAt + 1, url.length);
   const lastIndexOfColon = getLastIndexOfColon(hostname);
@@ -12,7 +39,9 @@ export function getProxyInfoFromUrl(
   let port: number | undefined = undefined;
   if (lastIndexOfColon === -1) {
     host = hostname;
-    port = 3128; // Default port
+    if (!protocol) {
+      port = 3128; // Default port
+    }
   } else {
     host = hostname.substring(0, lastIndexOfColon);
     port = Number(hostname.substring(lastIndexOfColon + 1, hostname.length));
@@ -30,8 +59,11 @@ export function getProxyInfoFromUrl(
     password = credentials.substring(indexOfColon + 1, credentials.length);
   }
 
+  port = port ? port : defaultPorts[protocol as Protocol];
+
   return {
-    type: "http",
+    type: proxySchemes[protocol as Protocol] ?? "PROXY",
+    protocol,
     host,
     port,
     username,
diff --git a/src/common/ts/proxySettings.ts b/src/common/ts/proxySettings.ts
index 2269791..d493f5f 100644
--- a/src/common/ts/proxySettings.ts
+++ b/src/common/ts/proxySettings.ts
@@ -92,7 +92,7 @@ function getProxyInfoStringFromUrls(urls: string[]): string {
   return [
     ...urls.map(url => {
       const proxyInfo = getProxyInfoFromUrl(url);
-      return `PROXY ${getUrlFromProxyInfo({
+      return `${proxyInfo.type} ${getUrlFromProxyInfo({
         ...proxyInfo,
         // Don't include username/password in PAC script.
         username: undefined,
diff --git a/src/options/options.ts b/src/options/options.ts
index bd18c9e..c78a016 100644
--- a/src/options/options.ts
+++ b/src/options/options.ts
@@ -336,12 +336,16 @@ function isOptimizedProxyUrlAllowed(url: string): AllowedResult {
     return [false, "TTV LOL PRO v1 proxies are not compatible"];
   }
 
-  if (/^https?:\/\//i.test(url)) {
-    return [false, "Proxy URLs must not contain a protocol (e.g. 'http://')"];
+  const proxyInfo = getProxyInfoFromUrl(url);
+  if (proxyInfo.host.includes("/")) {
+    return [false, "Proxy URLs must not contain a path (e.g. '/path')"];
   }
 
-  if (url.includes("/")) {
-    return [false, "Proxy URLs must not contain a path (e.g. '/path')"];
+  try {
+    const host = url.substring(url.lastIndexOf("@") + 1, url.length);
+    new URL(`http://${host}`); // Throws if the host is invalid.
+  } catch {
+    return [false, `'${url}' is not a valid proxy URL`];
   }
 
   try {
diff --git a/src/types.ts b/src/types.ts
index d642a20..86853f9 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -3,9 +3,19 @@ export type KeyOfType<T, V> = keyof {
   [P in keyof T as T[P] extends V ? P : never]: any;
 };
 
+// From https://chromium.googlesource.com/chromium/src/+/HEAD/net/docs/proxy.md#proxy-server-schemes
+export type ProxyScheme =
+  | "DIRECT"
+  | "PROXY"
+  | "HTTPS"
+  | "SOCKS"
+  | "SOCKS4"
+  | "SOCKS5"
+  | "QUIC";
+
 // From https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/proxy/ProxyInfo
 export interface ProxyInfo {
-  type: "direct" | "http" | "https" | "socks" | "socks4";
+  type: ProxyScheme;
   host?: string;
   port?: number;
   username?: string;