introduce resize_windows option

README.md

@@ -166,6 +166,7 @@ Ferrum::Browser.new(options)
   * `:pending_connection_errors` (Boolean) - When main frame is still waiting for slow responses while timeout is
       reached `PendingConnectionsError` is raised. It's better to figure out why you have slow responses and fix or
       block them rather than turn this setting off. Default is true.
+  * `:resize_windows` (Boolean) - Determines whether windows are automatically set to the window_size. Default is true.
   * `:browser_name` (Symbol) - `:chrome` by default, only experimental support
       for `:firefox` for now.
   * `:browser_path` (String) - Path to Chrome binary, you can also set ENV

lib/ferrum/browser.rb

@@ -75,6 +75,9 @@ class Browser
     #   why you have slow responses and fix or block them rather than turn this
     #   setting off.
     #
+    # @option options [Boolean] :resize_windows (true)
+    #   Whether browsers windows are automatically set to the window_size option.
+    #
     # @option options [:chrome, :firefox] :browser_name (:chrome)
     #   Sets the browser's name. **Note:** only experimental support for
     #   `:firefox` for now.

lib/ferrum/browser/options.rb

@@ -16,7 +16,7 @@ class Options
                   :js_errors, :base_url, :slowmo, :pending_connection_errors,
                   :url, :env, :process_timeout, :browser_name, :browser_path,
                   :save_path, :extensions, :proxy, :port, :host, :headless,
-                  :ignore_default_browser_options, :browser_options, :xvfb
+                  :ignore_default_browser_options, :browser_options, :xvfb, :resize_windows
 
       def initialize(options = nil)
         @options = Hash(options&.dup)
@@ -27,6 +27,7 @@ def initialize(options = nil)
         @js_errors = @options.fetch(:js_errors, false)
         @headless = @options.fetch(:headless, HEADLESS)
         @pending_connection_errors = @options.fetch(:pending_connection_errors, true)
+        @resize_windows = @options.fetch(:resize, true)
         @process_timeout = @options.fetch(:process_timeout, PROCESS_TIMEOUT)
         @browser_options = @options.fetch(:browser_options, {})
         @slowmo = @options[:slowmo].to_f

lib/ferrum/page.rb

@@ -404,8 +404,10 @@ def prepare_page
 
       inject_extensions
 
-      width, height = @browser.window_size
-      resize(width: width, height: height)
+      if @browser.options.resize_windows 
+        width, height = @browser.window_size
+        resize(width: width, height: height)
+      end
 
       response = command("Page.getNavigationHistory")
       transition_type = response.dig("entries", 0, "transitionType")