For all of those who just downloaded Firefox 1.5 and can’t get your extensions to work. This is a simple modification of Firefox’s configuration to trick the extensions to work. No need to manually edit the extensions to get them to work. Currently all the extensions I use work except the bookmark sync extension that I so dearly want to.
- At the location bar, enter: about:config. This will show you a list of Firefox internal preferences.
- Right-click on the list, select New > String
Enter “app.extensions.version� (without quotes) for the preference name.- 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.
Personally I think this is the best solution because you can always go back and delete the string later rather then fiddling with the extensions.
[UPDATE]
if you change 1.0 back to 1.5 Spoofstick [and potentially others] will continue to work and can also look for updates.
Thanks wgc
I'm a 
Dan, what are extensions? Are you talking about bookmarks? They are working. I am using the newest Firefox and installed it this afternoon.
Thanks,
dAVE
They’re like add-ons. Check them out here.
I plan to do a little extension roundup soon, so check back. Good to see you back.
Of course, this will prevent you from using any new plugins that only work on 1.5, but I guess for right now that makes sense.
Hey, whatever happened to Flock? I thought you were using that now.
I’m fed up with how Flock does bookmarks. Until they fix it I will be using the trusty old FF.
thx for the tip i tryed this works gr8 could you tell me how to hack the skin version numbers so i can use my longhorn skin or will this not work?
You can get the Bookmark Sync extension to work if you install it using the Nightly Tester Tools extension.
This will, however, disable all extensions only for Firefox 1.5, like foXpose.
I hope this doesn’t mess with the User Agent String.
Thanks man!
Thanks, I looked at your link and I don’t think I have any extensions. I’ll check it out later.
Thanks,
FYI, didn’t work for “minimize to tray” extension.
when i reloaded the browser it said to make sure I had the proper binary DLL or something like that.
just wanted to let u know.
The extension, Foxyvoice, also will NOT work with this method.
… but Spoofstick will work with this method. Also if you change 1.0 back to 1.5 Spoofstick will continue to work and can also look for updates. We tried this earlier as this digg is a duplicate of an earlier digg but more detailed.
works nice other than “minimize to tray”
but there is always bugs when modifing anything.
Thanks for the tip.
I looked at my config file, and there are tons of entries for extensions that I’ve tried, then ditched.
Can I get rid of these? Are they slowing things down by being there? How do I remove the offending entries?
Thanks
You didn’t create this, someone else discovered this several days before! Always cite your sources and where you got it from, the post you made makes it appear like you discovered this which I highly doubt.
Angry:
I did, you didn’t notice the “Original” link above? FYI: I found it weeks ago.
ahodge:
I don’t think the entries really matter since they most likely are only used by the extension itself and not Firefox itself. I’m probably wrong but I wouldn’t delete them.
Thanks for the tip!
Thanks. Great advice!
Great trick! Most of the extension just set maxVersion to be 1.0.x and therefore not compatible with 1.5
cool tip! some of my extensions did not work when I upgraded. this should help!
The “nightly tester tools” extension does this nicely and gives you a checkbox on the install dialog box (the one with the 3 sec pause) so you can overide the version and make compatable…
here’s a link: https://addons.mozilla.org/extensions/moreinfo.php?id=958
There’s a much easier way
I posted about same problem on my blog 1 day before your post 
Check http://maxt.dk/archives/2005/11/29/firefox-extensions-november-2005/
Probably want to update your post with this nifty info
Greetings!
Dan, It worked like a charm!
Thanks!!
It worked intially, but now my firefox has started to crash everytime i try and download something.
You must of done something else.
Thanks Dan, I am spreading the word. This worked great!
Well if you want the bookmark sync extension you can download it from http://www.beatnikpad.com/archives/2005/09/09/firefox-15-beta-compatible-extensions it works great with my Firefox 1.5 optimized for G4 .
I originally was dissapointed when changing the “app.extensions.versionâ€? to 1.0, because I couldn’t run 1.5 extensions. Well, I changed the value to 1.5, and all my 1.0 and 1.5 extensions work.
Thanks WGC, you made my life that much more pleasant.
DanGeech
Hello:
Read your post and followd your guideline. All my extensions are now working as they did with my previous version of Firefox 1.07. Thanks a lot. I had read about it but was reluctat to do it, fearing that it could hamper my Firefox 1.5 version.
However everything worked according to the book. Thanks a lot for this tip. I’m spreading the word at my block; Epiac’s Place. Take a look.
Cheers,
Omar.-
thanks for the info…
I am not back, just lurking in the background…
this is bloody great ! thank u!
This is a VERY bad method and will break all extensions that require 1.5 to work. Do it if you must, but using nightly tester tools to override and make your old extensions work is a much better method.
On a side note; you need to change version number back to “1.5″ if you want to use the Gmail Space extension too.
I applied the tip, but my Firefox now only run in safe mode. What can I do?
what is the location bar?
Hey DAN
1. Are those modification valid for the NEW ThunderBird v1.5?
Thanks, Ami
2. Do you know the date which TB 1.5 appeared?
I haven’t the slightest with either one of your questions because I use gmail.