diff -r 5b6d6859fdbc -r 741a44fc9992 firefox-devel.rst
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+.. -*- coding: utf-8; -*-
+.. include:: HEADER.rst
+
+==========================
+ Develop with/of Firefox.
+==========================
+.. contents::
+
+Useful developer plugin.
+========================
+
+Firebug.
+--------
+
+Firebug integrates with Firefox to put a wealth of development tools at your fingertips
+while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any
+web page.
+
+  http://getfirebug.com
+                home page
+  https://addons.mozilla.org/firefox/addon/1843
+                download page
+
+Live HTTP Headers.
+------------------
+
+ * First by adding a 'Headers' tab in 'View Page Info' of a web page.
+ * Second by adding a tool in the 'Tools->Web Development' menu to be able to display http
+   headers in real time (while pages are being downloaded from the Internet.
+ * Third by letting you edit request headers and replay an URL (beta). Look for the Replay
+   button in the live window!
+
+This project may be of some help for the following:
+
+ * Help debugging web application.
+ * See which kind of web server the remote site is using.
+ * See the cookies sent by remote site.
+
+Alternatively you can use fiddler2 (only Windows as it written in .NET)
+
+  http://livehttpheaders.mozdev.org/
+                home page
+  https://addons.mozilla.org/en-US/firefox/addon/3829/
+                download page
+  http://www.fiddler2.com/fiddler2/
+                Web Debugging Proxy
+
+Tamper Data.
+------------
+
+ * Use tamperdata to view and modify HTTP/HTTPS headers and post parameters.
+ * Trace and time http response/requests.
+ * Security test web applications by modifying POST parameters.
+
+Based on code and incompotable with "Live HTTP Headers" extensions.
+
+  http://tamperdata.mozdev.org/index.html
+                home page
+  https://addons.mozilla.org/en-US/firefox/addon/966/
+                download page
+  http://jimbojw.com/wiki/index.php?title=Tamper_Data
+                Tamper Data tutorial.
+
+Extension security.
+===================
+
+ * https://developer.mozilla.org/en/Security_best_practices_in_extensions
+
+Debugging in Firefox.
+=====================
+
+For JavaScript::
+
+  // Enables strict JavaScript warnings in the Error Console.
+  user_pref("javascript.options.strict", true);
+  // Logs errors in chrome files to the Error Console. Enable Components.utils.reportError().
+  user_pref("javascript.options.showInConsole", true);
+  // Disables the XUL cache so that changes to windows and dialogs do not require a restart.
+  user_pref("nglayout.debug.disable_xul_cache", true);
+  // Enables the use of the dump() statement to print to the standard console.
+  user_pref("browser.dom.window.dump.enabled", true);
+  // This enables to run JavaScript code snippets in the chrome context of the Scratchpad from the Tools menu.
+  user_pref("devtools.chrome.enabled", true);
+  // This will send more detailed information about installation and update problems to the Error Console.
+  user_pref("extensions.logging.enabled", true);
+  user_pref("dom.report_all_js_exceptions", true);
+
+See:
+
+  https://developer.mozilla.org/en/Setting_up_extension_development_environment
+                setting up profile, options and about developer plugin
+
+Debugging JavaScript with Web Console.
+--------------------------------------
+::
+
+  'console.log()', 'console.info()', 'console.warn()', 'console.error()'.
+
+See:
+
+  https://developer.mozilla.org/en/Using_the_Web_Console
+
+Debugging JavaScript with Firebug.
+----------------------------------
+
+With Firebug you can use 'console.log(obj)' for logging. Also output can be grouped with
+console.group("name") to start a new indentation block, and then console.groupEnd().
+
+Same but with different coloring do 'console.debug', 'console.info', 'console.warn', and
+'console.error' functions.
+
+'console.log' can format strings in the great tradition of printf.
+
+'console.trace()' - to print trace.
+
+  http://getfirebug.com/logging
+                logging
+  http://getfirebug.com/wiki/index.php/Console_API
+                Console API
+
+dump().
+-------
+
+Set in ``about:config`` ``browser.dom.window.dump.enabled`` to ``true``.
+
+All messages go to native console. On Windows this require ``-console`` option
+for ``firefox.exe``.
+
+  https://developer.mozilla.org/en/DOM/window.dump
+
+Components.utils.reportError.
+-----------------------------
+
+Write error msg to Error console (not in Web Console)::
+
+  Components.utils.reportError("msg");
+  // Show the error console.
+  toJavaScriptConsole();
+
+Firefox 3.x require set preference 'javascript.options.showInConsole' to 'true'
+which is default value fro Firefox 4.x.
+
+ * https://developer.mozilla.org/en/Components.utils.reportError
+
+Build Firefox from sources.
+===========================
+
+  https://developer.mozilla.org/en/Build_Documentation
+                Build Instructions
+  https://developer.mozilla.org/en/Mozilla_Source_Code_%28Mercurial%29
+                Getting Mozilla Source Code Using Mercurial
+
+Native Firefox debugging.
+=========================
+
+ * https://developer.mozilla.org/en/how_to_get_a_stacktrace_with_windbg
+
+Adding symbols from Symbol Server.
+----------------------------------
+
+Execute in WinDbg::
+
+  .sympath SRV*c:\symcache\*http://msdl.microsoft.com/download/symbols;SRV*c:\symcache\*http://symbols.mozilla.org/firefox
+
+or Ctrl+S and add::
+
+  SRV*c:\symcache\*http://msdl.microsoft.com/download/symbols;SRV*c:\symcache\*http://symbols.mozilla.org/firefox
+
+See:
+
+  https://developer.mozilla.org/en/Using_the_Mozilla_symbol_server