Make Old Extensions Work in Firefox 1.5
Filed in: Mozilla, Tips n Tricks — September 12th, 2005
I have reviewed the newly released Firefox 1.5 beta 1. It is great, however most of our “must have” extensions does not work on it yet. Here is a trick to make Firefox 1.0 extensions work in Firefox 1.5 (of course, this is only a temporary solution before your extensions upgrade.)
- At location bar, enter: about:config This will show you a list of Firefox internal preferences.

Right click on the list, select New > String- At preference name enter “app.extensions.version” (without quotes).
- Then, enter “1.0” (without quotes) as the value for app.extensions.version
- Restart Firefox 1.5, then enable those disabled Firefox extensions.
- Restart Firefox 1.5 again to active the extensions. Done.
Note: Some of the extensions are not working in Firefox 1.5 and caused errors when you enable them. We need to disable them for Firefox to work properly.
[ Thanks to Patrick who tells us this trick in his comment ]
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September 12th, 2005 at 4:40 am
ahhh i was looking for this was quite surprised when i too saw it missing. thanx!
September 12th, 2005 at 10:15 am
looks like you are using your iBook… lucky!
September 12th, 2005 at 3:38 pm
I’ve enabled all the extensions but there is no difference. How can I make it work? (Please tell more clearly)
September 12th, 2005 at 3:43 pm
Hello Liew. I have a problem here. I’ve enabled all the extensions but nothing is working. Could you tell me how? Please include the details…:)
September 12th, 2005 at 4:05 pm
the extensions should working if you enabled them. Please tell me more details.
September 12th, 2005 at 6:32 pm
Me too. Followed your instructions. But cannot enable the extensions.
September 12th, 2005 at 6:58 pm
As I said, it does not work for all extensions. If you found that it does not work, disable back the extensions.
September 12th, 2005 at 6:59 pm
No I mean none of the extensions I had can be enabled ( I have over 10). The “enabled” option is just grayed and cannot be clicked.
September 12th, 2005 at 7:09 pm
wait for the extensions upgrade.
I do not recommend beginner to use this trick.
September 12th, 2005 at 7:11 pm
I’ve downloaded another extension that is supposed to ‘force’ the extension to be enabled. It’s called ‘Nightly Tester Tools’. So far it works !!
September 13th, 2005 at 3:22 pm
ok, ok….:) Now i understand how…Thanx
September 15th, 2005 at 2:06 pm
[...] Looks like there is a trick to make some of the old extensions work in Firefox 1.5 . Take a look at LiewCF.com for the temporary solution. [...]
September 21st, 2005 at 5:10 pm
Viejas extensiones en Firefox 1.0.x a 1.5
Pero sin duda lo que más preocupa es el funcionamiento de nuestras extensiones favoritas que han dejado de funcionar. Existe una solucion temporal hasta que se actualicen a la nueva version, traduccion libre al castellano:
…
September 23rd, 2005 at 3:29 am
BTW, this trick works for Thunderbird, too. Quit TB, find its “prefs.js” file, and add this:
user_pref("app.extensions.version", "1.0");
Restart TB, re-enable your extensions (right-click). Quit, then restart again.
September 23rd, 2005 at 3:40 am
Thank you for the thunderbird trick, Dougal Campbell.
October 26th, 2005 at 10:00 pm
The “Nightly Tester Tools” extension has revived 15 extensions that did not work in Firefox 1.5. I run 31 unique extensions.
There were several steps, which I have outlined for you to follow:
1) Install from: https://addons.mozilla.org/extensions/moreinfo.php?application=firefox&id=958
2) Restart Firefox (use File>Exit)
3) Open the ‘Extensions’ window (Tools>Extensions), and click the new “Make all compatible” button. [This step immediately made compatible 10 of my 15 non-functioning extensions].
4) Uninstall all of the remaning non-compatible extensions. Make a list, because you will need to reinstall! [In my case, "unistalled" user preferences were later restored; specifically I had to uninstall DictionarySearch, but when it was eventually reinstalled my preferences restored themselves]
5) Reinstall each non-compatible extension. Check the new “Install Nightly Tester Tools to override compatibility” option on the ‘Software Installation’ window. [Most extensions can be found at https://addons.mozilla.org/extensions/?application=firefox
Hope this helps.
November 15th, 2005 at 2:14 am
Firefox Extensions pre v1.5
If you’ve updated to the bleeding edge release candidate of Firefox, you may notice that a lot of your plugins have been disabled. An article by LiewCF.com posted by Lifehacker.com provides a nice workaround.
…
November 15th, 2005 at 3:29 am
[...] [From LiewCF, via Lifehacker] Print Article You may also be interested in reading: [...]
November 15th, 2005 at 9:05 am
wow, you got linked by lifehacker and steve rubel!
November 15th, 2005 at 10:54 am
David: ya… I am surprised!
November 19th, 2005 at 4:42 pm
Making older extensions work in Firefox 1.5
A lot of people are using Firefox 1.5, already. At their third (and hopefully finall) release candidate stage, Firefox 1.5 promises to be the Bigger Better Deal when it comes to browsing. There’s just one problem. A lot of extension makers ha…
November 30th, 2005 at 11:41 pm
[...] From LiewCF.com Make Old Extensions Work in Firefox 1.5 [...]
December 1st, 2005 at 8:02 pm
[...] Via: LiewCF. [...]
December 1st, 2005 at 11:19 pm
[...] If you’ve downloaded FF 1.5 you need to try out this FF 1.5 only extension. It shows thumbnails of all the open tabs with a click of a button. Really cool. Just don’t try to install it if you’ve used something like this to make older extensions work under FF 1.5. read more | digg story [...]
December 24th, 2005 at 2:41 am
[...] Firefox 1.5 RC2 isn’t the stable final release - which will become available later this year - so proceed with installation (and this configuration change) with caution. Make Old Extensions Work in Firefox 1.5 [LiewCF.com via Micropersuasion] [...]
December 24th, 2005 at 12:38 pm
[...] Firefox 1.5 disabled old extensions? : Solution Here Propz to Vampyre for passing me this link. When I installed Firefox 1.5, some of my old extensions hadn’t been updated yet and were disabled on the new version. I used this tweak and now everything works fine. Check it out: http://www.liewcf.com/blog/archives…-in-firefox-15/ __________________ vintage ‘04 sig by: i-moses [...]
December 24th, 2005 at 6:04 pm
[...] If some of your old extensions dont work anymore after upgrading to the newer version just do this simple hack.. Just tried if with "proxy button" Works great! http://www.liewcf.com/blog/archives…-in-firefox-15/ __________________ Report Post | IP: Logged [...]
January 3rd, 2006 at 7:44 am
[...] Make Firefox’s Old Extensions Work With 1.5 Are you a Firefox user who upgraded to 1.5, and had some extensions that don’t work anymore because not compatible with that version, and no compatibility upgrade is available yet ? Try this >> 01/02/2006 (0) [...]
March 1st, 2006 at 4:41 am
I have been looking for an Biet-O-Zilla update for the latest firefox update released on the 1st Feb 2006. Finding this has enabled the latest firefox to use this great bit of ebay software. There are instructions to muck about with various Biet-O-Zilla files to get it working on the extention download site. I tried without getting it to work. This far simpler and gets the job done. Nice one many many thanks
March 2nd, 2006 at 6:17 am
[...] http://www.liewcf.com/blog/archives/2005/09/make-old-extensions-work-in-firefox-15/ [...]
March 21st, 2006 at 11:57 pm
Wow, that was easy. Thanks. I wonder why they don’t make that the default option?
July 19th, 2006 at 2:29 pm
[...] I found Liew Cheon Fong’s solution listed on John’s blog and was ever so grateful. I’m putting a copy below for easy reference. [...]
October 26th, 2006 at 1:12 am
[...] This is from liewcf.com Although dated to Firefox 1.5, this should work for the latest release. [...]
October 28th, 2006 at 3:18 am
[...] This is from liewcf.com Although dated to Firefox 1.5, this should work for the latest release. [...]