Restoring mozilla's bookmarks

Firefox 3 no longer uses bookmarks.html to store the bookmarks. It stores the bookmarks and the browser history in places.sqlite and no longer creates a HTML backup by default instead there are also JSON backups in the bookmarkbackups folder within the Firefox profile folder.
Check for backups in following path : 
C:\Documents and Settings\<User Name>\Application Data\Mozilla\Firefox\Profiles\<some  folder>\bookmarkbackups


See Lost_Bookmarks (MozillaZine KB)
You can export the bookmarks in Firefox to a HTML file: Bookmarks > Organize Bookmarks > Import & Backup > Export HTML
You can also create a JSON backup: Bookmarks > Organize Bookmarks > Import & Backup > Backup

If migrating to new account , then just copy the latest JSON file to new account's bookmarkbackup folder and restore it in mozilla.
You should restore a JSON backup: Bookmarks > Organize Bookmarks > Import & Backup > Restore-> Choose file
 Restoring a JSON backup will replace all existing bookmarks. You can merge bookmarks if you import a HTML backup.

A HTML backup doesn't support tags and annotations, so if you want to preserve those then you need to use a JSON backup.

Opening .hxt/.hxc type of help files available with platform SDK's from MSDN

These type of files which are made available under help folder and are in Microsoft Help 2.0 format can be opened with "dexplore.exe" viewer. This utility is available at "C:\Program Files\Common Files\Microsoft Shared\Help 9". You can open files by typing the following at a command prompt, or associating it with a
desktop shortcut:

<path>\dexplore.exe /helpcol ms-help://<namespace>

where <namespace> is the name under which the help file has been registered on your system. For example:

"C:\Program Files\Common Files\Microsoft Shared\Help\dexplore.exe"
/helpcol ms-help://MS.xxxxx.xx


You can use either Dave Liske's custom Help 2.0 viewer (http://www.mvps.org/htmlhelpcenter/mshelp2/h2view.html) or Rob Chandler's FAR utility (http://helpware.net/FAR/index.html). These both let you display a list of the registered namespaces and choose the one to initialise. FAR Utility will also work for windows vista while h2view will not work. These utilities are replacement for dexplore.exe and will be simple to use.

So by using correct name space and  creating shortcut you can read the help files.
Even if you want you can use Help 2.0 viewer for viewing your help files as per your namespace.
"File->Open Namespace" Then select namespace and initialise.


If you want to create a shortcut just do right mouse click and say create shortcut. Then give the path or above mentioned command ( ""C:\Program Files\Common Files\Microsoft Shared\Help 9\dexplore.exe" /helpcol ms-help://MS.MSDNQTR.v90.en" ) and give the name for shortcut and you are done.

Check this link for creation of Gadget

Hi,
Please check this link for learning to develop your own gadget:
http://code.google.com/apis/gadgets/
Gadgets are some simple JAVA script applications which can be embedded on webpages.
Above link contains many other links to other pages which contain information on gadgets.