I need help about using menu Tools/Developper functions like Inspector, Additive Design, Debugger, Simple JavaScript Editor, Stiles Editor etc.
In the later versions of firefox fow Windows (14 and later) the menu item Tools|Web designer gained a set of new fuctions except Error Console. I cannot find anywhere the description of how to use new functions listed in the question
ప్రత్యుత్తరాలన్నీ (4)
and there are also quite few interesting articles at hacks.mozilla.org which where written introducing these features that may help you:
https://hacks.mozilla.org/2011/11/developer-tools-in-firefox-aurora-10/
https://hacks.mozilla.org/2012/03/firefox-aurora-13-developer-tools-updates/
https://hacks.mozilla.org/2012/07/debugger-responsive-design-view-and-more-in-firefox-aurora-15/
https://hacks.mozilla.org/2012/09/html-editing-and-other-improvements-in-firefox-17-developer-tools/
i hope this information can help for a start ;-)
Thanka a lot! I helped.
You can enable the error console by setting the related devtools.errorconsole.enabled pref to true on the about:config page.