Top 150 Popular Firefox Extensions and Opera
Tuesday, July 4, 2006 1:07:20 AM
Updated again: the extensions list, and the summary below, was last updated 2007-06-08, taking into account the new Addons site. Lots of sleazy spyware toolbars were finally removed. Added a few corrections based on comments here at 2007-06-17. Added a few more correction at 2007-07-29. Thanks!
Updated: the extensions list, and the summary below, was last updated 2006-12-09, taking into account the Firefox 2 release that made some extensions obsolete. Firefox out-of-the-box is catching up to Opera
Based on initial research
from Dodd in the my.opera.com forums, I've compiled a list of the Top 150 most popular Firefox extensions, and classified the availability of the functionality they offer in Opera.
extensions.html
Some extensions are Firefox-specific (only relevant for managing Firefox itself), and there is considerable overlap in functionality for several extensions. That leaves the following summary:
[updated]After the December 3, 2006 update, out of 96 sets of extensions:
[updated again]After the July 29, 2007 update, out of 113 sets of extensions:
Corrections are welcome, but only from people who have actually studied both the extension and Opera's behavior. 'why would I need it' is a valid reaction to some extensions, but will probably not lead to changes in the table
Updated: the extensions list, and the summary below, was last updated 2006-12-09, taking into account the Firefox 2 release that made some extensions obsolete. Firefox out-of-the-box is catching up to Opera

Based on initial research
from Dodd in the my.opera.com forums, I've compiled a list of the Top 150 most popular Firefox extensions, and classified the availability of the functionality they offer in Opera.extensions.html
Some extensions are Firefox-specific (only relevant for managing Firefox itself), and there is considerable overlap in functionality for several extensions. That leaves the following summary:
- 41 extensions offer out of the box functionality in Opera 9, with roughly equivalent capability,
- 13 extensions are available by installing a UserScript or a Widget or dragging a button,
- 17 extensions require advanced customization or are only partially available,
- 45 extensions are not available at all in Opera.
[updated]After the December 3, 2006 update, out of 96 sets of extensions:
- 32 (sets of) extensions offer out of the box functionality in Opera 9, with roughly equivalent capability,
- 11 (sets of) extensions are available by installing a UserScript or a Widget or dragging a button,
- 13 (sets of) extensions require advanced customization or are only partially available,
- 40 (sets of) extensions are not available at all in Opera,
- 3 extensions are are Firefox specific (like dictionaries).
[updated again]After the July 29, 2007 update, out of 113 sets of extensions:
- 38 (sets of) extensions offer out of the box functionality in Opera 9, with roughly equivalent capability,
- 14 (sets of) extensions are available by installing a UserScript or a Widget or dragging a button,
- 21 (sets of) extensions require advanced customization or are only partially available,
- 38 (sets of) extensions are not available at all in Opera,
- 4 extensions are Firefox specific.
Corrections are welcome, but only from people who have actually studied both the extension and Opera's behavior. 'why would I need it' is a valid reaction to some extensions, but will probably not lead to changes in the table







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A.RuzanovLex1 # Monday, May 12, 2008 2:00:28 PM
Afair, thumbalizr.com uses IE engine for creating screenshots. It may be useful, but it not analogue «Screengrab!».
A.RuzanovLex1 # Sunday, May 25, 2008 1:15:01 PM
BleedingHeart # Saturday, June 14, 2008 8:07:59 AM
I think so to, but for most people its a toy to play with, for developers it wont be much use, but there are 3rd party programs for that, but for 95% of the people who actually use the plugin it should be good enough.
G.SandlerCreat0R # Saturday, June 14, 2008 9:02:03 AM
For Opera can be done via button: Restart Opera
Or change the item in [Browser File Menu]
For Opera 9.5 it's more safely because of launch speed.
There is also Linkifier UserJS that works not only in text files: linkifier.js
MyOpera team, please fix this!fearphage # Sunday, June 15, 2008 7:59:45 PM
Rijk # Monday, June 16, 2008 1:30:57 PM
arkheii # Saturday, June 21, 2008 10:27:38 AM
https://dragonfly.opera.com/
Wojciech EysymonttNasty # Thursday, July 3, 2008 10:30:31 PM
I would suggest to add one more colour to the scale, GOLD maybe, when functionality is not just similar, but significantly better/more useful in Opera, than extension in Firefox - like iin this point, where you have not only "Open in IE" option, but you can choose from more browsers.
Also GOLD would be Synchronize function which is superior in Opera compared to Firefox amatour sometimes-works-often-buggy-or-incompatible solutions.
You might also want to highlight (either also by the gold colour or in separate way) the functions which are introduced by Opera and copied by Firefox (like Speed dial) and which are natural solution in Opera (like 18 and 25 - behaviour of tabs).
This way it would be even more powerful list.
bobsmith1 # Tuesday, August 5, 2008 9:38:44 AM
Also, once I whitelist a script host with noscript, it will be whitelisted on every site I visit, even if I have never visited that particular site before. This is pretty useful for video hosting services, for example, where you run into the same few hosts again and again. Not possible in Opera.
The JS blocking functionality is of pretty limited usefulness... I can't really see any use for it at all given that it is all or nothing for a given site. Most sites will not function very well or at all without some JS. Most commercial sites also contain annoying scripts. With Opera you get nothing or all of that. With FireFox I can get just what I want.
If it wasn't for this deficiency I think I would prefer Opera.
Rijk # Thursday, August 7, 2008 9:49:24 AM
MyOpera team, please fix this!fearphage # Friday, August 8, 2008 9:12:29 AM
Originally posted by Rijk:
It is just the nature of the beast. It seems like in most cases (speed dial extension) the extension developers are not focusing on ease of use but on functionality and configurability. In the case of the speed dial extension, you can use it without configuring much and get Opera's functionality out of the box. However, you can configure a bajillion options (3 tabs worth) and get all kinds of fancy, cool, useful functionality out of it. In my opinion, Opera devs religiously (read: far too often) trade ease of use for configurability and functionality. Disclaimer: Keep in mind I don't use speed dial in either browser (ff or opera). I merely researched the extension to compare and contrast it to Opera's implementation.The main reason that I believe extensions outperform Opera's implementations is because Opera's finite number of developers are trying to compete with 10s of thousands (if not more) of extension developers. It is not a fair fight. Even if you found a case where Opera's implementation was superior, it would be 100 times more likely for the extension developer to go back and improve the extension than it would for Opera devvs to improve their side where extensions outperform Opera. The devs can't afford to be in an arms race with extensions. It would be too time consuming and a losing battle as they are greatly outnumbered.
Case in point, Mozilla recently launched a Firebug team to research and dev new Firebug strategies. Maybe the number of in-house Mozilla devs working on Firebug is congruent or similar to the number of devs working on Dragonfly but on top of that Firebug has a whole community of developers around it because it is the gold standard for web developer tools.
szlevi # Monday, August 25, 2008 4:27:14 PM
MyOpera team, please fix this!fearphage # Friday, September 26, 2008 5:03:50 PM
Originally posted by Rijk:
Did this happen yet? Was it pushed back to a later release?Are you planning on updating the list at any point?
A.RuzanovLex1 # Saturday, September 27, 2008 5:13:32 PM
«VideoDownloader Widget» - Don't work, at least for youtube.
«Adblock Plus: Element Hiding Helper» - Approximate analogue: Remove_it_permanently-for_Opera.js
«NoScript» - Approximate analogue: BlockIt.js.
«"Open in IE" button» don't work in Opera 9.5. Variant with separated html-page - works.
«User Agent Switcher _ Site preferences > Network» - «Site preferences > Network» does not allow to set necessary User Agent (for instance, it needed for sites which oriented on mobile browsers), therefore it must have light green color (limited functionality).
«Megaupload SX.3» - megaupload_com.js
«Flashblock» - FlashBlocker now includes a variant (show flash size) which looks like Flashblock for FF.
«ScrapBook _ Notes (text only), or Dmitry's OBook Plugin (Windows only)» - As a result of bug with superfluous quotes in Opera 9.5, OBook now works only partly. Also, Qsaver have some functions, as saving selected part of page, similar to ScrapBook.
«gTranslate _ Selected text context menu» - Google translate supported many more languages. There exists two userjs for it: google-translation with tooltip and google-translate.
«Save Image in Folder» - Qsaver or this method.
A.RuzanovLex1 # Saturday, September 27, 2008 6:14:04 PM
Google auto-suggest - Not available.
Text autocomplete - ops.js.
Sorting search engines - http://my.opera.com/SearchEdit
Source code of selection - UserJS or button.
Full screen mode with autohide panels - Not available, but you can try this buttons.
Copy formatted text (aka rtf) - htm2clip.
Copy vertical text blocks (with ctrl, Word-like) - Not available?
Information about page - Sidebar Info + extra-download-links.js. (Sidebar contains absolute useless «Navigation links», but does not contain info about images or embedded objects)
Disable loading images for the site - Not available? (maybe content blocker).
A.RuzanovLex1 # Monday, September 29, 2008 6:40:05 PM
Or bookmarklet (second link from above).
GuillermoGuille # Friday, April 17, 2009 2:48:47 PM
Rijk # Sunday, April 19, 2009 2:47:37 PM
I'm actualy working on an update right now. Expect it soon!
Agentjp # Friday, February 12, 2010 11:19:19 PM
dapxin # Saturday, February 13, 2010 11:40:01 AM
digitalinksmudge # Thursday, February 18, 2010 4:38:14 AM
Id like to see this as advertisement.
Why have to defend yourself, when you can advertise yourself?
Cheers!
MyOpera team, please fix this!fearphage # Thursday, February 18, 2010 10:58:46 AM
Originally posted by digitalinksmudge:
This is not a positive to some people. Many technologically-adept people complain that they would use Opera if it were merely a browser and not a suite. The swiss-army-knife approach actually turns some users away. Advertising how much stuff it has that it doesn't need is not a good thing in my book. FF may take 45 extensions to be able to do what Opera can do, but you can never make Opera be just a browser like Firefox. There is power in the ability to customize.digitalinksmudge # Monday, February 22, 2010 2:56:06 AM
Originally posted by fearphage:
Indeed!
Cheers!
scroogescr00g3 # Sunday, May 30, 2010 7:59:37 PM
This line is factually wrong.
Please fix that line to [red]Not available[/red]
What user agent switcher does can not be replicated in Opera. It is one of the weakest Opera points IMHO.
Opera limits user agents to three pre-determined strings. Two additional strings can be selected, which does not include the term "Opera", but neither of those choices can be made persistent.
There is NO option in opera to configure the user agent string at will. You can't make a custom user agent string.
(Using Opera 10)
lifeh2o # Monday, August 16, 2010 8:19:28 PM
FF:4 Foxmarks Bookmark Synchronizer / OnlineBookmarkManager Synchronizer / Google Browser Sync
Opera:
Third party tool oSync (now opera link)