diff --git a/Dockerfile b/Dockerfile
index 7f8f03c..c13b0a7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,9 +5,9 @@ ARG TARGETPLATFORM
 ARG BUILDPLATFORM
 RUN printf "I am running on ${BUILDPLATFORM:-linux/amd64}, building for ${TARGETPLATFORM:-linux/amd64}\n$(uname -a)\n"
 
-# Install the web browser (package firefox-esr is available too)
+# Install the web browser (package firefox is available too)
 RUN apk update && \
-    apk add --no-cache firefox dumb-init && \
+    apk add --no-cache firefox-esr dumb-init && \
     rm -Rf /var/cache
 
 # Copy FlareSolverr code
diff --git a/src/services/sessions.ts b/src/services/sessions.ts
index 8729840..ce1a40b 100644
--- a/src/services/sessions.ts
+++ b/src/services/sessions.ts
@@ -119,15 +119,14 @@ export async function create(session: string, options: SessionCreateOptions): Pr
 
   // todo: cookies can't be set in the session, you need to open the page first
 
-  const args: string[] = [];
   const puppeteerOptions: LaunchOptions = {
     product: 'firefox',
     headless: process.env.HEADLESS !== 'false',
-    args
   }
 
-  log.debug('Creating userDataDir for session.')
-  puppeteerOptions.userDataDir = prepareBrowserProfile(sessionId, options.proxy)
+  log.debug('Creating UserDataDir for session')
+  // note: puppeteerOptions.userDataDir only works in recent firefox versions
+  puppeteerOptions.args = ['--profile ' + prepareBrowserProfile(sessionId, options.proxy)];
 
   // if we are running inside executable binary, change browser path
   if (typeof (process as any).pkg !== 'undefined') {