I got some great feedback after I updated URL Fixer to be compatible with Fennec, Mozilla's mobile browser, and I'm happy to announce that I've been able to add Fennec compatibility to four more add-ons:

• TwitterBar: Post to Twitter from Firefox's address bar
• AutoAuth: Automatically submits authentication dialogs
• YouTube Comment Snob (still in the sandbox): Filter out lame comments on YouTube
• Slashdotter (still in the sandbox): Adds features to the Slashdot website

So far, I've found it pretty easy to port add-ons to Fennec, with the following caveats:

• You can't install add-ons in Fennec by opening them from your computer; I wrote a script to copy the add-on directly into the Fennec profile, much like an add-on IV drip - straight into the bloodstream!
• There's no easy access to the error console , but you can open it manually if you grab the address from Firefox.
• No DOM Inspector. For now, just browse the source.

It seems that all of these issues could be solved with a "Fennec Add-on Development" extension; maybe that will be my next project, unless easier solutions already exist.

1. Look and feel: I updated all of the icons for the extension to blend in with Firefox 3's new OS-specific look and feel. The sidebar's toolbar uses the native theme icons, and the toolbar button is specifically designed to fit in on each of Mac OSX, Linux, and Windows. (The toolbar buttons for Windows, Mac, and Linux are shown respectively below.)

   

2. Continuous updating: Feed Sidebar used to only check for feed updates when the sidebar was open; now it checks whether the sidebar is open or not (and notifies you when it finds updates). Big improvements in memory usage and performance were necessary to make this possible.
3. Offline capabilities: the extension now caches all of your feeds, so if you go offline, you still have access to all of the data that was in the feeds, and you can read it while offline. When you go offline, Feed Sidebar goes into "Offline Mode", and automatically opens the stored summary from the feed when you click on an item rather than trying to open the webpage the item references. This features makes use of the new online/offline events in Firefox 3.

   Here is a screenshot of what offline reading looks like:

   

4. Places integration: when you add or delete a live bookmark in Firefox 3, Feed Sidebar will detect that via Firefox 3's nsINavBookmarksService interface. When you add a new feed, it will instantly appear in the sidebar, and the reverse is true for deleting a feed.
5. Caching: as soon as you start Firefox, Feed Sidebar will fill the sidebar with the feeds you were reading the last time Firefox shut down, even if you are now offline. This is made possible via the new JSON libraries that shipped with Firefox 3.

Feed Sidebar 3.0 is now available at Mozilla Add-ons.

Usage: $ ./unused-entities.sh path/to/locale-directory/ path/to/content-directory/

#!/bin/bash

echo "Unused entities:"

for dtdfile in `ls $1*.dtd`
do
	awk '/<!ENTITY/ {print $2}' < $dtdfile | while read line
	do
		search=`grep -R "${line}" "$2"`
		if [ "$search" == "" ]
		then
			echo "${line}";
		fi
	done;
done;

echo ""
echo "Unused properties:"

for propfile in `ls $1*.properties`
do
	awk -F "=" '{if (!($2 == "")) { print $1 }}' < $propfile | while read line
	do
		search=`grep -R "${line}" "$2"`
		if [ "$search" == "" ]
		then
			echo "${line}";
		fi
	done;
done;