diff --git a/src-tauri/src/commands/dependencies.rs b/src-tauri/src/commands/dependencies.rs
index 0d7a629..7dfbad9 100644
--- a/src-tauri/src/commands/dependencies.rs
+++ b/src-tauri/src/commands/dependencies.rs
@@ -1,14 +1,15 @@
 use serde::Serialize;
 use std::io::{BufRead, BufReader};
 use std::process::{Command, Stdio};
+use std::thread;
 use tauri::ipc::Channel;
 
-use crate::models::DependencyStatus;
+use crate::models::{CookieSource, DependencyStatus};
 use crate::services::dependency_manager;
 
 #[tauri::command]
-pub fn check_dependencies() -> Vec<DependencyStatus> {
-    dependency_manager::get_all_dependency_statuses()
+pub fn check_dependencies(cookie_source: CookieSource) -> Vec<DependencyStatus> {
+    dependency_manager::get_all_dependency_statuses(&cookie_source)
 }
 
 #[derive(Clone, Serialize)]
@@ -33,11 +34,31 @@ pub async fn install_dependency(
         .spawn()
         .map_err(|e| format!("Failed to start install: {e}"))?;
 
-    if let Some(stdout) = child.stdout.take() {
-        let reader = BufReader::new(stdout);
-        for line in reader.lines().map_while(Result::ok) {
-            let _ = on_event.send(InstallEvent::Output { line });
-        }
+    let stdout_handle = child.stdout.take().map(|stdout| {
+        let on_event_stdout = on_event.clone();
+        thread::spawn(move || {
+            let reader = BufReader::new(stdout);
+            for line in reader.lines().map_while(Result::ok) {
+                let _ = on_event_stdout.send(InstallEvent::Output { line });
+            }
+        })
+    });
+
+    let stderr_handle = child.stderr.take().map(|stderr| {
+        let on_event_stderr = on_event.clone();
+        thread::spawn(move || {
+            let reader = BufReader::new(stderr);
+            for line in reader.lines().map_while(Result::ok) {
+                let _ = on_event_stderr.send(InstallEvent::Output { line });
+            }
+        })
+    });
+
+    if let Some(handle) = stdout_handle {
+        let _ = handle.join();
+    }
+    if let Some(handle) = stderr_handle {
+        let _ = handle.join();
     }
 
     let status = child.wait().map_err(|e| format!("Install failed: {e}"))?;
diff --git a/src-tauri/src/services/dependency_manager.rs b/src-tauri/src/services/dependency_manager.rs
index 2d533a9..f8a494a 100644
--- a/src-tauri/src/services/dependency_manager.rs
+++ b/src-tauri/src/services/dependency_manager.rs
@@ -1,4 +1,4 @@
-use crate::models::DependencyStatus;
+use crate::models::{CookieSource, DependencyStatus};
 use std::process::Command;
 
 pub fn check_tool_exists(name: &str) -> Option<String> {
@@ -22,10 +22,14 @@ pub fn check_js_runtime() -> Option<String> {
     check_tool_exists("deno").or_else(|| check_tool_exists("node"))
 }
 
-pub fn check_pot_plugin() -> bool {
-    let output = Command::new("yt-dlp")
-        .args(["-v", "--simulate", "https://www.youtube.com/watch?v=dQw4w9WgXcQ"])
-        .output();
+pub fn check_pot_plugin(cookie_source: &CookieSource) -> bool {
+    let mut command = Command::new("yt-dlp");
+    command
+        .arg("-v")
+        .arg("--simulate")
+        .args(cookie_source.to_ytdlp_args())
+        .arg("https://www.youtube.com/watch?v=dQw4w9WgXcQ");
+    let output = command.output();
 
     match output {
         Ok(out) => {
@@ -36,12 +40,12 @@ pub fn check_pot_plugin() -> bool {
     }
 }
 
-pub fn get_all_dependency_statuses() -> Vec<DependencyStatus> {
+pub fn get_all_dependency_statuses(cookie_source: &CookieSource) -> Vec<DependencyStatus> {
     let ffmpeg = check_tool_exists("ffmpeg");
     let ytdlp = check_tool_exists("yt-dlp");
     let js_runtime = check_js_runtime();
     let pot_plugin = if ytdlp.is_some() {
-        check_pot_plugin()
+        check_pot_plugin(cookie_source)
     } else {
         false
     };
@@ -95,6 +99,7 @@ pub fn get_install_args(dep_name: &str) -> Result<Vec<String>, String> {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::models::CookieSource;
 
     #[test]
     fn test_get_install_args_ffmpeg() {
@@ -121,7 +126,7 @@ mod tests {
 
     #[test]
     fn test_dependency_statuses_has_four_entries() {
-        let statuses = get_all_dependency_statuses();
+        let statuses = get_all_dependency_statuses(&CookieSource::default());
         assert_eq!(statuses.len(), 4);
         assert_eq!(statuses[0].name, "ffmpeg");
         assert_eq!(statuses[1].name, "yt-dlp");
diff --git a/src/lib/bindings/dependencies.ts b/src/lib/bindings/dependencies.ts
index 8bddc17..6edb02a 100644
--- a/src/lib/bindings/dependencies.ts
+++ b/src/lib/bindings/dependencies.ts
@@ -7,12 +7,24 @@ export interface DependencyStatus {
   installCommand: string;
 }
 
+export type CookieSource =
+  | { type: 'browser'; browser: string }
+  | { type: 'file'; path: string }
+  | { type: 'none' };
+
+const DEFAULT_COOKIE_SOURCE: CookieSource = {
+  type: 'browser',
+  browser: 'firefox',
+};
+
 type InstallEvent =
   | { event: 'output'; data: { line: string } }
   | { event: 'finished'; data: { success: boolean } };
 
-export async function checkDependencies(): Promise<DependencyStatus[]> {
-  return invoke<DependencyStatus[]>('check_dependencies');
+export async function checkDependencies(
+  cookieSource: CookieSource = DEFAULT_COOKIE_SOURCE
+): Promise<DependencyStatus[]> {
+  return invoke<DependencyStatus[]>('check_dependencies', { cookieSource });
 }
 
 export async function installDependency(