Runtime Directories
default application installation and user profile directories firefox os application directory user profile directory temporary directory windows vista/7 c:\program files\mozilla firefox\ c:\users\<username>\appdata\roaming\mozilla\firefox\ (or %appdata%\mozilla\firefox\) c:\users\<username>\appdata\local\mozilla\firefox\ (or %localappdata%\mozilla\firefox) and c:\users\<username>\appdata\local\virtualstore\program files\mozilla firefox\ windows 2000/xp c:\program files\mozilla firefox\ c:\documents and settings\<username>\application data\mozilla\firefox\ (or %appdata%\mozilla\firefox\) c:\documents and settings\<username>\local settings\application data\mozilla\firefox\ os x /applications/firefox.app ~/...
... ~/.mozilla/firefox/xxxxxxxx.default/ n/d thunderbird os application directory user profile directory temporary directory windows vista/7 c:\program files\mozilla thunderbird\ c:\users\<username>\appdata\roaming\thunderbird\ (or %appdata%\thunderbird\) c:\users\<username>\appdata\local\thunderbird\ (or %localappdata%\thunderbird\) and c:\users\<username>\appdata\local\virtualstore\program files\mozilla thunderbird\ windows 2000/xp c:\program files\mozilla thunderbird\ c:\documents and settings\<username>\application data\thunderbird\ (or %appdata%\thunderbird\) c:\documents and ...

Thunderbird Configuration Files
just browse to c:\documents and settings\[user name]\application data\thunderbird\profiles\ on windows xp/2000 or c:\users\[user name]\appdata\roaming\thunderbird\profiles\ on windows vista, and the rest should be obvious.
...you will be taken to the "real" folder, which is normally c:\documents and settings\[user name]\application data on windows xp/2000, c:\users\[user name]\appdata\roaming on windows vista.

ctypes.open
ices.jsm"); var cr = components.classes['@mozilla.org/chrome/chrome-registry;1'].getservice(components.interfaces.nsichromeregistry); var chromeuri_mylib = services.io.newuri('chrome://youraddon/content/mysubfolder/mycfunctionsforunix.so', 'utf-8', null); var localfile_mylib = cr.convertchromeurl(chromeuri_mylib); var jarpath_mylib = localfile_mylib.spec; // "jar:file:///c:/users/vayeate/appdata/roaming/mozilla/firefox/profiles/aecgxse.unnamed%20profile%201/extensions/youraddon@jetpack.xpi!/mysubfolder/mycfunctionsforunix.so" var filepath_mylib = localfilemylib.path; // "file:///c:/users/vayeate/appdata/roaming/mozilla/firefox/profiles/aecgxse.unnamed%20profile%201/extensions/youraddon@jetpack.xpi!/mysubfolder/mycfunctionsforunix.so" if your add-on is a bootstrap add-on, then you don't need to...
...if addon is packed, this will be addon xpi } this can then be joined with your file name to obtain it's path like this: function startup(adata, areason) { var jarpath_folder = 'jar:' + os.path.tofileuri(adata.installpath.path) + '!/'; // if unpacked is false in install.rdf this will look like: "jar:file:///c:/users/vayeate/appdata/roaming/mozilla/firefox/profiles/aksozfjt.unnamed%20profile%2010/extensions/asynczip@jetpack!/" var filepath_folder = adata.installpath.path; // if unpacked is set to false in install.rdf this will look like: "c:\users\vayeate\appdata\roaming\mozilla\firefox\profiles\aksozfjt.unnamed profile 10\extensions\asynczip@jetpack" var filepath_mylib = os.path.join(filepath_folder, 'mysubfolder', 'mycfun...

Chapter 4: Using XPCOM—Implementing advanced processes - Archive of obsolete content
on windows vista, it will be located at c:\users\username\appdata\roaming\mozilla\firefox\profiles\random number.default\ ; on windows xp or 2000, it will be c:\documents and settings\username\application data\mozilla\firefox\profiles\random number.default\ ; on linux, it will be ~/.mozilla/firefox/random number.default/ ; on mac os x, it will be ~/library/application support/firefox/profiles/random number.default/ in the interests of security, delete these lines from...

MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
my tests were on windows vista, and i noticed at least one difference, it is that paths changed; now the profile is in (for my procacci user sample): c:\users\procacci\appdata\roaming\thunderbird\profiles\v6we4uku.default start in debug mode in comand line interface: debug with displayerror() here's the result, i used the displayerror() method ( not the best way :-( see bug 206294 ) to show environment and ldap variables in order to check that it worked fine.

What XULRunner Provides - Archive of obsolete content
x only) activex control (windows only) (not yet complete) obsolete since gecko 7.0 nsview-based-widget (mac os x only) (not yet complete) the "maybe" list the following features have been discussed and may be included if developer time permits and code size is controlled: ldap support spellchecking support (with or without dictionaries provided) see bug 285977 core support for profile roaming (with application-specific extensibility) pyxpcom embedding (not yet complete) - but it does work, if you compile a custom build that includes the pyxpcom bindings and there is a working python available.

The "why" of web performance - Learn web development
and if this site were loaded on a us carrier's international roaming plan?

How to investigate Disconnect failures
check if firefox crashed: windows: [user]/appdata\roaming\mozilla\firefox\crash reports ubuntu: [user/home]/.mozilla/firefox/crash reports and there we can check by timestamp if firefox crashed when we had the disconnect.

JavaScript OS.Constants
winappdatadir the path to the user's roaming application data directory.

Setting up the Gecko SDK
next run the regxpcom to registister the component in firefox (this writes to the complist.dat file in your profile) regxpcom -x "c:\program files (x86)\mozilla firefox\" -c "c:\users\<user>\appdata\roaming\mozilla\firefox\profiles\<profile>\compreg.dat" -d "c:\users\<user>\appdata\roaming\mozilla\firefox\profiles\<profile>\xpti.dat" "c:\users\<user>\appdata\roaming\mozilla\firefox\profiles\<profile>\extensions\bob@george.com\cspecialthing.dll" now if you start up firefox using that profile, you should have your new component installed.