On September 15 of the last two years, I’ve posted about the year’s Top Ten Add-ons and made comments and observations on them. Continuing the tradition, here are this year’s top ten lists:

2009 Rank	By Total Downloads	By Active Daily Users
Source: extension and theme downloads and update pings from addons.mozilla.org for add-ons that a user must opt-in to installing. (excludes other add-on types and extensions that are bundled with 3rd party software)
1	FlashGot	Adblock Plus
2	Adblock Plus↑1	Video DownloadHelper↑1
3	NoScript↓1	IE Tab↓1
4	Video DownloadHelper↑4	Download Statusbar
5	DownThemAll!↓1	DownThemAll!↑1
6	IE Tab↓1	Greasemonkey↑2
7	Greasemonkey↑7	FlashGot↓2
8	Download Statusbar↓2	Firebug↑1
9	Forecastfox	NoScript
10	Noia 2.0 (eXtreme)↓3	Cooliris↑5

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One year ago today I made a blog post listing the “top 10″ add-ons according to three different sources of data. The point of that post was to show the differences in the methods and highlight how a single add-on might be outstanding in one area (for example, downloads), but not in another (for example, user retention/active users). I wanted to show these lists for 2008 and take a look at how much those lists can change over the course of a year.

First, the data for 2008:

2008 Rank	By Total Downloads	By Active Daily Users
Source: extension and theme downloads and update pings from addons.mozilla.org for add-ons that a user must opt-in to installing. (excludes other add-on types and extensions that are bundled with 3rd party software)
1	FlashGot	Adblock Plus
2	NoScript	IE Tab↑2
3	Adblock Plus↑3	Video DownloadHelper↑39
4	DownThemAll!↑7	Download Statusbar↓1
5	IE Tab↑4	FlashGot↓3
6	Download Statusbar↑4	DownThemAll!↑5
7	Noia 2.0 (eXtreme)↓4	Forecastfox™↓2
8	Video DownloadHelper↑52	Greasemonkey↑9
9	Forecastfox™↓4	NoScript↑3
10	VideoDownloader↓6	Firebug↑6

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I’ve wanted to make this post for awhile and never got around to it, but a recent conversation reminded me about it. Below are the “top 10″ add-ons (extensions and themes) collected three different ways. (This table best viewed on my actual blog.)

	Total Downloads	Active Users	Facebook Favorites
1	FlashGot	Adblock Plus	Adblock Plus
2	NoScript	FlashGot	Greasemonkey
3	Noia 2.0 (eXtreme)	Download Statusbar	Download Statusbar
4	VideoDownloader	IE Tab	Web Developer
5	Forecastfox	Forecastfox	IE Tab
6	Adblock Plus	VideoDownloader	Firebug
7	Adblock	Noia 2.0 (eXtreme)	Tab Mix Plus
8	Fasterfox	Fasterfox	del.icio.us Bookmarks
9	IE Tab	Tab Mix Plus	StumbleUpon
10	Download Statusbar	PDF Download	FoxyTunes

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