diff --git a/README.md b/README.md
index 420b434..2ba69f5 100644
--- a/README.md
+++ b/README.md
@@ -5,17 +5,22 @@ Extract cookies from Firefox, Chrome or Chromium sqlite cookie stores into a wge
 
 ### Install ###
 
-gem install cookie_extractor
+    gem install cookie_extractor
 
 ### Usage ###
 
-cookie_extractor /path/to/firefox/cookies.sqlite > cookies.txt
+    cookie_extractor /path/to/firefox/cookies.sqlite > cookies.txt
+    
+    cookie_extractor --guess    # Guess which browser to use and open corresponding file
+    
+    cookie_extractor --browser chrome|chromium|firefox    # Open corresponding  DB
+
 
 Typical locations for the cookies file on Linux are:
 
- * Firefox: ~/.mozilla/firefox/(profile directory)/cookies.sqlite
- * Chrome: ~/.config/google-chrome/Default/Cookies
- * Chromium: ~/.config/chromium/Default/Cookies
+ * Firefox: *~/.mozilla/firefox/(profile directory)/cookies.sqlite*
+ * Chrome: *~/.config/google-chrome/Default/Cookies*
+ * Chromium: *~/.config/chromium/Default/Cookies*
 
 ### License ###
 
diff --git a/bin/cookie_extractor b/bin/cookie_extractor
index 6f808b8..95a25d6 100755
--- a/bin/cookie_extractor
+++ b/bin/cookie_extractor
@@ -2,22 +2,46 @@
 
 require File.expand_path(File.join(File.dirname(__FILE__), "..", "lib", "cookie_extractor"))
 
-# TODO: Locate cookie dbs automatically
-filename = ARGV.first
-unless filename
-  puts "Usage: (Firefox) cookie_extractor /path/to/cookies.sqlite"
-  puts "       (Chrome)  cookie_extractor /path/to/Cookies"
+
+def usage msg=nil
+  puts msg if msg
+  puts "Usage: cookie_extractor /path/to/cookies.sqlite              Open a DB file"
+  puts "       cookie_extractor --guess                              Guess which browser to use and open corresponding file"
+  puts "       cookie_extractor --browser chrome|chromium|firefox    Open DB corresponding to a particular browser"
   exit
 end
 
-if File.exists?(filename)
-  begin
-    extractor = CookieExtractor::BrowserDetector.new_extractor(filename)
-    puts extractor.extract.join("\n")
-  rescue SQLite3::NotADatabaseException,
-    CookieExtractor::BrowserNotDetectedException
-    puts "Error: File '#{filename}' is not a Firefox or Chrome cookie database"
-  end
-else
-  puts "Error: File '#{filename}' does not exist"
+
+begin
+  extractor =
+    case ARGV.first
+    when '--guess', '-g'
+      begin
+        CookieExtractor::BrowserDetector.guess()
+      rescue CookieExtractor::NoCookieFileFoundException
+        abort "Error: we couldn't find any supported broswer's cookies"
+      end
+    when '--browser', '-b'
+      browser = ARGV[1]
+      usage "Error: Please supply a browser name" unless browser
+      begin
+        CookieExtractor::BrowserDetector.browser_extractor(browser)
+      rescue CookieExtractor::InvalidBrowserNameException
+        abort "Error: '#{browser}' is not a valid browser name"
+      rescue CookieExtractor::NoCookieFileFoundException
+        abort "Error: Could not locate cookie file for browser #{browser}"
+      end
+    when nil
+      usage
+    else
+      filename = ARGV.first
+      abort "Error: #{filename} does not exist" unless File.exists?(filename)
+      CookieExtractor::BrowserDetector.new_extractor(filename)
+    end
+  puts extractor.extract.join("\n")
+rescue SQLite3::NotADatabaseException,
+  CookieExtractor::BrowserNotDetectedException        
+  abort "Error: File '#{filename}' is not a Firefox or Chrome cookie database"
 end
+
+
diff --git a/lib/cookie_extractor/browser_detector.rb b/lib/cookie_extractor/browser_detector.rb
index b64dfd9..de67f05 100644
--- a/lib/cookie_extractor/browser_detector.rb
+++ b/lib/cookie_extractor/browser_detector.rb
@@ -1,7 +1,46 @@
 module CookieExtractor
   class BrowserNotDetectedException < Exception; end
+  class InvalidBrowserNameException < Exception; end
+  class NoCookieFileFoundException < Exception; end
 
   class BrowserDetector
+    @cookie_locations = {
+      "chrome" => "~/.config/google-chrome/Default/Cookies",
+      "chromium" => "~/.config/chromium/Default/Cookies",
+      "firefox" => "~/.mozilla/firefox/*.default/cookies.sqlite"
+    }
+
+
+    # Returns the extractor of the most recently used browser's cookies
+    #   or raise NoCookieFileFoundException if there are no cookies
+    def self.guess
+      full_cookie_locations = @cookie_locations.select { |browser, path|
+          !Dir.glob(File.expand_path(path)).empty?
+      }.sort_by { |browser, path|
+        File.mtime(Dir.glob(File.expand_path(path)).first)
+      }.reverse.each { |tuple|
+        browser = tuple.first
+        begin
+          extractor = self.browser_extractor(browser)
+        rescue BrowserNotDetectedException, NoCookieFileFoundException
+          # better try the next one...
+        else
+          return extractor
+        end
+      }
+      # If we make it here, we've failed...
+      raise NoCookieFileFoundException, "Couldn't find any browser's cookies"
+    end
+
+    # Open a browser's cookie file using intelligent guesswork
+    def self.browser_extractor(browser)
+      raise InvalidBrowserNameException, "Browser must be one of: #{self.supported_browsers.join(', ')}" unless self.supported_browsers.include?(browser)
+      paths = Dir.glob(File.expand_path(@cookie_locations[browser]))
+      if paths.length < 1 or not File.exists?(paths.first)
+        raise NoCookieFileFoundException, "File #{paths.first} does not exist!"
+      end
+      self.new_extractor(paths.first)
+    end
 
     def self.new_extractor(db_filename)
       browser = detect_browser(db_filename)
@@ -12,6 +51,10 @@ module CookieExtractor
       end
     end
 
+    def self.supported_browsers
+      @cookie_locations.keys
+    end
+
     def self.detect_browser(db_filename)
       db = SQLite3::Database.new(db_filename)
       browser =