diff --git a/src/components/nav/EnvironmentSelector.tsx b/src/components/nav/EnvironmentSelector.tsx
new file mode 100644
index 0000000..61cbaed
--- /dev/null
+++ b/src/components/nav/EnvironmentSelector.tsx
@@ -0,0 +1,48 @@
+import { useRouter } from 'next/router';
+import { useEffect } from 'react';
+
+import { Environment, envDisplayValue, environments } from '../../consts/environments';
+import { useEnvironment } from '../../store';
+import { getQueryParamString, replacePathParam } from '../../utils/queryParams';
+import { SelectField } from '../input/SelectField';
+
+export function EnvironmentSelector() {
+  const router = useRouter();
+  const { environment, setEnvironment } = useEnvironment();
+
+  const queryEnv = getQueryParamString(router.query, 'env');
+  useEffect(() => {
+    if (!queryEnv || queryEnv === environment) return;
+    if (environments.includes(queryEnv as Environment)) {
+      setEnvironment(queryEnv as Environment);
+    }
+    // special case to alias testnet as testnet2
+    if (queryEnv.toLowerCase() === 'testnet') {
+      setEnvironment(Environment.Testnet2);
+    }
+    // Only run once on mount
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  const onSelect = (env: string) => {
+    setEnvironment(env as Environment);
+    replacePathParam('env', env);
+  };
+
+  return (
+    <div className="relative">
+      {/* <Image src={HubIcon} width={20} height={20} className="opacity-70" /> */}
+      <SelectField
+        classes="w-24 text-gray-600 border-gray-600 bg-gray-50 text-[0.95rem]"
+        options={envOptions}
+        value={environment}
+        onValueSelect={onSelect}
+      />
+    </div>
+  );
+}
+
+const envOptions = [
+  { value: Environment.Mainnet, display: envDisplayValue[Environment.Mainnet] },
+  { value: Environment.Testnet2, display: envDisplayValue[Environment.Testnet2] },
+];
diff --git a/src/components/nav/Header.tsx b/src/components/nav/Header.tsx
index da29c06..26ae60c 100644
--- a/src/components/nav/Header.tsx
+++ b/src/components/nav/Header.tsx
@@ -2,7 +2,6 @@ import Image from 'next/future/image';
 import Link from 'next/link';
 import useDropdownMenu from 'react-accessible-dropdown-menu-hook';
 
-import { Environment, envDisplayValue } from '../../consts/environments';
 import { links } from '../../consts/links';
 import BookIcon from '../../images/icons/book.svg';
 import BugIcon from '../../images/icons/bug.svg';
@@ -11,8 +10,8 @@ import HouseIcon from '../../images/icons/house.svg';
 import InfoIcon from '../../images/icons/info-circle.svg';
 import Logo from '../../images/logos/hyperlane-logo.svg';
 import Name from '../../images/logos/hyperlane-name.svg';
-import { useStore } from '../../store';
-import { SelectField } from '../input/SelectField';
+
+import { EnvironmentSelector } from './EnvironmentSelector';
 
 export function Header({ pathName }: { pathName: string }) {
   const { buttonProps, itemProps, isOpen, setIsOpen } = useDropdownMenu(4);
@@ -44,7 +43,7 @@ export function Header({ pathName }: { pathName: string }) {
           <a className={styles.navLink} target="_blank" href={links.home} rel="noopener noreferrer">
             About
           </a>
-          <NetworkSelector />
+          <EnvironmentSelector />
         </nav>
         <div className="relative flex item-center sm:hidden mr-2">
           <button className="hover:opactiy-70 transition-all" {...buttonProps}>
@@ -98,30 +97,6 @@ function DropdownItemContent({ icon, text }: { icon: any; text: string }) {
   );
 }
 
-function NetworkSelector() {
-  const { environment, setEnvironment } = useStore((s) => ({
-    environment: s.environment,
-    setEnvironment: s.setEnvironment,
-  }));
-
-  return (
-    <div className="relative">
-      {/* <Image src={HubIcon} width={20} height={20} className="opacity-70" /> */}
-      <SelectField
-        classes="w-24 text-gray-600 border-gray-600 text-[0.95rem]"
-        options={envOptions}
-        value={environment}
-        onValueSelect={(e: string) => setEnvironment(e as Environment)}
-      />
-    </div>
-  );
-}
-
-const envOptions = [
-  { value: Environment.Mainnet, display: envDisplayValue[Environment.Mainnet] },
-  { value: Environment.Testnet2, display: envDisplayValue[Environment.Testnet2] },
-];
-
 const styles = {
   navLink:
     'flex items-center tracking-wide text-gray-600 text-[0.95rem] hover:underline hover:opacity-70 decoration-2 underline-offset-[6px] transition-all',
diff --git a/src/consts/environments.ts b/src/consts/environments.ts
index ae4c6cb..56ff638 100644
--- a/src/consts/environments.ts
+++ b/src/consts/environments.ts
@@ -3,6 +3,8 @@ export enum Environment {
   Testnet2 = 'testnet2',
 }
 
+export const environments = Object.values(Environment);
+
 export const envDisplayValue = {
   [Environment.Mainnet]: 'Mainnet',
   [Environment.Testnet2]: 'Testnet',
diff --git a/src/features/debugger/TxDebugger.tsx b/src/features/debugger/TxDebugger.tsx
index af61cb6..b0eec1b 100644
--- a/src/features/debugger/TxDebugger.tsx
+++ b/src/features/debugger/TxDebugger.tsx
@@ -1,5 +1,6 @@
 import { useQuery } from '@tanstack/react-query';
 import Image from 'next/future/image';
+import { useRouter } from 'next/router';
 import { useState } from 'react';
 
 import { Fade } from '../../components/animation/Fade';
@@ -14,6 +15,7 @@ import { envDisplayValue } from '../../consts/environments';
 import ShrugIcon from '../../images/icons/shrug.svg';
 import { useStore } from '../../store';
 import useDebounce from '../../utils/debounce';
+import { getQueryParamString, replacePathParam } from '../../utils/queryParams';
 import { sanitizeString, toTitleCase } from '../../utils/string';
 import { isValidSearchQuery } from '../search/utils';
 
@@ -22,8 +24,11 @@ import { MessageDebugResult, TxDebugStatus, debugMessageForHash } from './debugM
 export function TxDebugger() {
   const environment = useStore((s) => s.environment);
 
+  const router = useRouter();
+  const txHash = getQueryParamString(router.query, 'txHash');
+
   // Search text input
-  const [searchInput, setSearchInput] = useState('');
+  const [searchInput, setSearchInput] = useState(txHash);
   const debouncedSearchInput = useDebounce(searchInput, 750);
   const hasInput = !!debouncedSearchInput;
   const sanitizedInput = sanitizeString(debouncedSearchInput);
@@ -35,9 +40,13 @@ export function TxDebugger() {
     data,
   } = useQuery(
     ['debugMessage', isValidInput, sanitizedInput, environment],
-    () => {
-      if (!isValidInput || !sanitizedInput) return null;
-      else return debugMessageForHash(sanitizedInput, environment);
+    async () => {
+      if (!isValidInput || !sanitizedInput) {
+        replacePathParam('txHash', '');
+        return null;
+      }
+      replacePathParam('txHash', sanitizedInput);
+      return debugMessageForHash(sanitizedInput, environment);
     },
     { retry: false },
   );
diff --git a/src/pages/_app.tsx b/src/pages/_app.tsx
index b801128..0400b00 100755
--- a/src/pages/_app.tsx
+++ b/src/pages/_app.tsx
@@ -65,7 +65,6 @@ export default function App({ Component, router, pageProps }: AppProps) {
     return <div></div>;
   }
 
-  const pathName = router.pathname;
   return (
     <ErrorBoundary>
       <WagmiConfig client={wagmiClient}>
@@ -79,7 +78,7 @@ export default function App({ Component, router, pageProps }: AppProps) {
         >
           <QueryClientProvider client={reactQueryClient}>
             <UrqlProvider value={urqlClients[environment]}>
-              <AppLayout pathName={pathName}>
+              <AppLayout pathName={router.pathname}>
                 <Component {...pageProps} />
               </AppLayout>
             </UrqlProvider>
diff --git a/src/pages/debugger.tsx b/src/pages/debugger.tsx
index ab90d22..517d66a 100755
--- a/src/pages/debugger.tsx
+++ b/src/pages/debugger.tsx
@@ -11,4 +11,11 @@ const Debugger: NextPage = () => {
   );
 };
 
+// Required for dynamic routing to work by disabling Automatic Static Optimization
+export async function getServerSideProps() {
+  return {
+    props: {},
+  };
+}
+
 export default Debugger;
diff --git a/src/store.ts b/src/store.ts
index 3ebdf43..614ba10 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -17,3 +17,10 @@ export const useStore = create<AppState>()((set) => ({
   bannerClassName: '',
   setBanner: (className: string) => set(() => ({ bannerClassName: className })),
 }));
+
+export function useEnvironment() {
+  return useStore((s) => ({
+    environment: s.environment,
+    setEnvironment: s.setEnvironment,
+  }));
+}
diff --git a/src/utils/queryParams.ts b/src/utils/queryParams.ts
new file mode 100644
index 0000000..056798d
--- /dev/null
+++ b/src/utils/queryParams.ts
@@ -0,0 +1,28 @@
+import type { ParsedUrlQuery } from 'querystring';
+
+import { logger } from './logger';
+
+// To make Next's awkward query param typing more convenient
+export function getQueryParamString(query: ParsedUrlQuery, key: string, defaultVal = '') {
+  if (!query) return defaultVal;
+  const val = query[key];
+  if (val && typeof val === 'string') return val;
+  else return defaultVal;
+}
+
+// Circumventing Next's router.replace method here because
+// it's async and causes race conditions btwn components.
+// This will only modify the url but not trigger any routing
+export function replacePathParam(key: string, val: string) {
+  try {
+    const url = new URL(window.location.href);
+    if (val) {
+      url.searchParams.set(key, val);
+    } else {
+      url.searchParams.delete(key);
+    }
+    window.history.replaceState('', '', url);
+  } catch (error) {
+    logger.error('Error replacing path param', error);
+  }
+}