3 Ways to Make Old Extensions Compatible with Firefox 2.0
- Posted by Gleb Reys on September 2nd, 2006 filed in firefox
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So, I’ve had some more time to play with the latest build of Firefox, and I liked it so much that I couldn’t use the 1.5 version anymore. And this left me with a problem: hardly any of my extensions were compatible with the latest and greatest Firefox version.
I’ve made a bit of a research out of it, and here we are: I present you with the 3 ways to make extensions compatible with Firefox 2.0.
Firefox Books
If you like Firefox, you will find the following books extremely useful:
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First though, I’d like to give you a few warnings:
- not 100% of your extensions will work,some of the older ones would really be incompatible. But if you had Firefox 1.5, than I doubt you’ll have any problems.
- if you update any of the “made compatible” extensions using the automatic update function of Firefox, you may easily end up with an incompatible version again. This means you’ll probably have to make it compatible once more.
That said, I hope you will find useful at least one of the following ways to make old extensions Firefox 2.0 compatible. I’ve also given you the main advantage and disadvantage of using each of the methods.
1) Making Extensions Compatible - THE EASY WAY
All you have to do is to go and download a wonderful Nightly Tester Tools extension. Not only it is compatible with your newest Firefox version, but it will also add a button to your Extensions manager (Tools->Add-ons):
Just click this button and restart your browser. Please note that this is a screenshot taken AFTER making all the xtensions compatible - so as you can see they’re all active already.

The advantage of this way is that it’s really easy to make all your extensions compatible with any Firefox until Firefox 3.0 (that’s what this extension puts as the MaxVersion for each of the extensions it fixes)
The disadvantage is that there is no equally easy way to revert the changes, so once “made compatible”, your extensions will stay this way - there is no button to make them uncompatible again. However, disabling the extension seems to restore the versions.
2) Making Extensions Compatible - THE FIREFOX GURU WAY
What you can do is open the configuration (about:config) in your Firefox browser, right click the list and create a boolean extensions.checkCompatibility option there. Set its value to false and restart the browser.
Most of your extensions should work now. If you go to the Add-ons dialog, it will look like this:

As you can see, extensions which would otherwise be incompatible, are flagged with the exclamation mark. You can also see a warning message which suggest you enable the compatibility check again.
The advantage of this approach is that it’s really simple to make the change which affects all the extensions.
The disadvantage is that this way can be used as a temporary solution only, as it may lead to unpredictable consequences (some really old or really new extensions may malfunction).
3) Making Extensions Compatible - THE HARD WAY
This is essentially a manual way of accomplishing the result of using the Nightly Tester Tools extension.
The advantage of this way is in total control over which extensions you’ll hack to become compatible.
The disadvantage is in the fact that every step of this method is rather hard: distinguishing extensions to make sure you’re changing the one you really want, and
manually changing the versions supported.
- Close your browser
- Go to the folder with all your Firefox extensions:
C:\Documents and Settings\USER\Application Data\Mozilla\Firefox\Profiles\PROFILE\extensions In this line, USER is to be replaced with your Windows login, and PROFILE will be the name of your Firefox profile (weird looking folder name, usually the only one found in Profiles folder) - You’ll see a list of folders there, 1 folder for each extension. The names of the folders are the unique identifiers for extensions, so they may seem scary at first:
{34274bf4-1d97-a289-e984-17e546307e4f} - this is the Adblock extension GUID. - Go to any folder, and open the install.rdf file for editing with your favorite clear text editor. Notepad works, but using it will make things even harder cause it doesn’t part rdf files properly. Your choice
Now back to the business. You need to look for 2 things:
- name of the extension, to make sure you’re editing the right oneJust look for the em:name, and try to recognize the extension from the description that follows:
<!– Front End MetaData –>
<em:name>Adblock</em:name>
<em:description>Filters ads from web-pages</em:description>
<em:creator>The Adblock Crew</em:creator>
<em:contributor>Henrik Aasted Sorensen</em:contributor> - a block of minimal and maximum Firefox versions the extension will work on.
Warning: there could be few similar blocks with versions, so make sure you’ll edit the one which has EXACTLY this em:id, the one which belongs to Firefox browser: ec8030f7-c20a-464f-9b0e-13a3a9e97384.
<!– FireFox –>
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>0.7</em:minVersion>
<em:maxVersion>1.5</em:maxVersion>
</Description>
</em:targetApplication> - name of the extension, to make sure you’re editing the right oneJust look for the em:name, and try to recognize the extension from the description that follows:
- Edit the maxVersion parameter (shown in bold to make it easier), and change it from 1.5 to 2.0b2.
- Remove the extensions.cache file from the C:\Documents and Settings\USER\Application Data\Mozilla\Firefox\Profiles\PROFILE\ folder - this will make sure Firefox will read all the changes from install.rdf files and pick up the now “compatible” extension
- Restart your browser, enable the previously disabled extension you’ve just edited
- Restart your browser again to activate this extension
There you have it. Enjoy!













September 11th, 2006 at 6:57 am
[...] + Make Your Old Extensions Work Again! [...]
September 21st, 2006 at 10:29 pm
Thank you for this article! I was wondering about this recently and here is the answer. Keep the great tips coming.
September 21st, 2006 at 10:35 pm
Thanks for stopping by to comment, Kelly! I\’m glad some of my tips are helpful.
See you around!
September 23rd, 2006 at 3:21 am
Great. Thank you!
September 27th, 2006 at 2:27 am
You’re always welcome, Alfredo!
September 29th, 2006 at 10:30 pm
3 Ways to Make Old Extensions Compatible with Firefox 2…
So, I’ve had some more time to play with the latest build of Firefox, and I liked it so much that I couldn’t use the 1.5 version anymore. And this left me with a problem: hardly any of my extensions were compatible with the latest and great…
October 1st, 2006 at 3:24 am
I think users can also download the fantastic extension, MR. Tech’s Local Install: http://www.mrtech.com/extensions/local_install/
In addition to adding a feature to “Make All Compatible,” the extension offers many other useful options for handling extensions–too many to list here. This extension makes a number of other FF extensions unnecessary. Highly recommended.
October 1st, 2006 at 6:15 pm
Brilliant, number 2 worked great. The only thing that stopped me using FF2 was my extensions not working.
Thanks Gleb, thanks StumbleUpon!
October 23rd, 2006 at 9:13 pm
[...] If you find some of your Firefox extensions broken and no update exists, you can do the fix. [...]
October 23rd, 2006 at 9:56 pm
[...] http://www.perfectblogger.com/2006/09/make-extensions-compatible-with-firefox2/ [...]
October 24th, 2006 at 3:19 am
[...] Firefox 2.0 is perhaps the most compatible with old extensions that I’ve seen yet, and incorporates an entirely new tab-navigation style, allowing for scrolling between tabs with arrows on either side of the window, and a redesigned interface and theme. Extensions and addons are in a more central location, and checking for updates is a one-click process now. Having trouble with your previous extensions, try the tips here: [ 3 Ways to Make Old Extensions Compatible with Firefox 2 ] [...]
October 25th, 2006 at 6:36 am
[...] Firefox 2.0 went out of beta today, with the final release available from Mozilla. So those who has been hesitant to use Zotero with a beta browser can now go forth and download. If you’re still worrying about your other Firefox extensions and whether they are compatible with Firefox 2.0, please read “3 Ways to Make Old Extensions Compatible with Firefox 2.0.” If you’re using Internet Explorer, why not try out the latest and greatest Firefox and see what you’ve been missing (including a certain extension that will make your research easier…). [...]
October 25th, 2006 at 11:43 am
[...] If you didn’t know its out already, so click here to download, you will notice though that alot of your extensions won’t work so till then they have updated them read the post here and do step two which resolves it. You then just have to check daily to see if there are any updates. [...]
October 25th, 2006 at 5:49 pm
[...] So you’ve upgraded to the newest version of Firefox, but there is that one add-on that you can’t live without. This article shows you three ways to help make your old extensions compatible with Firefox 2.0. [...]
October 25th, 2006 at 5:49 pm
[...] So you’ve upgraded to the newest version of Firefox, but there is that one add-on that you can’t live without. This article shows you three ways to help make your old extensions compatible with Firefox 2.0. [...]
October 25th, 2006 at 7:57 pm
Firefox 2.0 & Add-ons…
Über Firefox und seine Erweiterungen wird eher da drüben berichtet. Mit Erscheinen von Firefox 2.0 wurde trotz vieler Verbesserungen das Problem mit der Kompatibilität der alten Erweiterungen aktuell. Mit MR Tech’s Local Install sollte dies nun je…
October 26th, 2006 at 12:23 pm
[...] Source: PerfectBlogger [...]
October 27th, 2006 at 7:53 pm
[...] Three ways to force Firefox extensions compatibility [...]
October 27th, 2006 at 10:15 pm
Thaaaaanks…I was looking for the first one, but here you have two more options THANKS!
October 28th, 2006 at 3:34 am
Thanks for the tip, David!
PoscoChubb, Ricky: always a pleasure!
October 28th, 2006 at 7:13 am
Very nice… Thanks for sharing…
October 28th, 2006 at 1:01 pm
[...] Il est possible de forcer le fonctionnement des extensions 1.5 non compatibles 2.0. Avec “Nightly Tester” (extension compatible 2.0), c’est extrêmement simple, ça fonctionne, j’ai essayé, avec “Customize Google”, “Mozilla Calendar” et “Diigo toolbar” (qui a une fonctionnalité particulière bien utile pour bloguer: c’est la possibilité de copier sans format) en particulier, mais je ne garantis pas d’éventuels dysfonctionnement (j’ai l’impression d’un petite perte de rapidité, laquelle est un des plus de 2.0 par rapport à 1.5). Utile pour les extensions indispensables? Je suis preneur (en commentaires) d’autres résultats de tests. Source (et informations complètes): 3 Ways to Make Old Extensions Compatible with Firefox 2.0. [...]
October 28th, 2006 at 3:18 pm
Hi Keith, it was fun to research and I’m pleased so many people find it useful!
November 8th, 2006 at 8:41 am
Very Nice, gets PlainOldFavorites working :-)\
Thanks !!!
November 16th, 2006 at 7:49 pm
[...] Encontrei, num outro blog, três maneiras de tornar extensões antigas compatíveis com o Firefox 2.0 (em inglês). Cada uma delas tem vantagens e desvantagens. Mas, em todos os métodos, estamos forçando extensões que não foram desenhadas para esta versão, a funcionar com ela. Ou seja, é arriscado! [...]
November 19th, 2006 at 7:47 pm
great article, thank you for it.
there’s an extension called “extension manager extended” which includes in firefox’ extension manager window the unique identifier of each extension. it also adds a right-click context menu entry to open the selected extension’s folder.
it makes it a lot easier to use your method #3, since you don’t need to figure out which folder belongs to the extension you want to edit.
the “extension manager extended” can be found in https://addons.mozilla.org/firefox/2195/.
November 27th, 2006 at 3:56 pm
Thanks for the comment, Christian!
I think I’ll give this extension a try.
November 30th, 2006 at 4:47 pm
Firefox: 4 Ways to Make Old Extensions Compatible with Firefox 2.0…
With Firefox 2.0, many of old extensions facing compatibility problem!Gleb Reys posted <a href=”http://www.perfectblogger.com/2006/09/make-extensions-compatible-with-firefox2/”>3-ways to make old firefox extensions compatible with firefox……
December 22nd, 2006 at 12:58 am
I’m quite partial to the third method, myself. It may take a bit of coding know how, but it’s a more permanent solution I think (especially for an amateur extension like Deviantart’s DeviantMessage which doesn’t get updated often).
December 24th, 2006 at 1:30 am
Hi Jeff,
I agree. Some extensions are not dynamic enough, and if there are only a few - it is practical indeed to fix them yourself.
Thanks for sharing your experience! See you around!
December 29th, 2006 at 4:08 pm
Thanks, you saved my day!
December 29th, 2006 at 8:25 pm
Hi Eric!
Glad to have helped you
See you around!
Gleb
January 10th, 2007 at 11:43 pm
[...] Step 1: Upgrade to version 2.0 (beta) Step 2: Get all your old extensions to work: 3 Ways to Make Old Extensions Compatible with Firefox 2.0 at Perfect Blogger [...]
February 2nd, 2007 at 7:38 am
I didn’t know I’ve been doing it the hard way. Thanks for providing easier options.
February 2nd, 2007 at 2:22 pm
Always a pleasure, Patricia!
February 6th, 2007 at 12:57 am
[...] 3 Ways to Make Old Extensions Compatible with Firefox 2.0 (tags: internet) [...]
April 19th, 2007 at 4:45 am
Thnaks for the detailed description. Really usefull.
April 25th, 2007 at 9:28 am
Always a pleasure! Come back fo more!
May 31st, 2007 at 9:17 am
[...] working on it and cmder is only compatible up to Firefox 1.5. I forced the install using this Chrome hack and was able to get it installed. Unfortunately, it totally corrupted my Firefox install to the [...]
October 6th, 2007 at 7:05 pm
[...] Reys posted 3-ways to make old firefox extensions compatible with firefox 2.0! The three way covers up so many details that u will end up either making ur old extensions [...]
December 23rd, 2007 at 8:03 pm
[...] UPDATE: No, we don’t have to wait five years. Just check out this entry and follow the instructions, or go straight to this site to download the extension you need. [...]
March 11th, 2008 at 7:00 pm
This surely fixed my Google Notifier add-on. Thanks.
June 2nd, 2008 at 12:02 am
I owe you. You made my 5 extensions work which were not working earlier. Loved the third one in particular. Dugg! Thanks