Firefox Portable

User has successfully used a third-party tool to register FF portable as the default browser in Windows.

User wants to be able to retain this setting while launching other instances (different versions) of FF portable.

When AllowMultipleInstances=true is set in .ini, the default browser setting no longer works correctly. For example, clicks to hyperlinks in the system or via other apps will now open the wrong FF instead of the default instance.

About FF v89 that it was a major UI change, a major cock-up IMHO.
For the past few years, after the last UI change and it was working well up to v.88 I was using Aris' userChrome.css tweak to keep my tabs below
the address bar {no Bookmarks bar, turned off in the drop-down} from over at GitHub.
Now v89 has destroyed it and over at mozzillazine guys like me are scrambling to try to find ways of fixing it.
It seems that the silent majority, me included, like our tabs on the bottom and Mozilla themselves is not listening.

I get a white screen with a thick blue bar at the top and nothing else. It just sits there unless I manually go into the Task Manager and kill it. This started with FF 90 beta. Previous versions updated fine.

PS: I always use the PortableApps built-in updater to update.

Hello to all!
I used many years version 2.0.6.0 of executable file FirefoxPortable.exe and all was good, but i have a problem with extensions(plugins), every time when i prepared my build with all extensions and copying in another place i need again INSTALLING ALL EXTENSIONS.
This thing very boring for me and i need to be updated for the new build of the FirefoxPortable.exe 2.3.0.0 and problem with extensions solved.
I was been very Happy

I'm trying to update Firefox portable and get the message "Extract: error writing to file omni.ja"

I've tried using the regular updater as well as downloading the installer package and am getting the same error message.

Any help appreciated.

Hi,

Firefox Dev Edition 90.0 b1 is HTTP 404

"The requested URL /portableapps/FirefoxPortableDeveloper/FirefoxPortableDeveloper_90.0_Beta_1_English.paf.exe was not found on this server."

Another update. another F-up. Every time I try to open a (web-)link from an outside program (mail, excel, ...) I get a popup telling me "another instance of firefox is already running. Please close other instances of firefox before launching mozilla firefox, portable edition". If I completely ignore the popup (=leave it open), en click the SAME link a second time, it is opened in firefox portable. But that requester remains open till I click it . So: opening a weblink is now a "please click three times, because FF does not like users" thing? Any solution ideas?

I am using FirefoxPortable v88. This works perfectly under Windows 7 but when the same flash drive is started using Windows 10 64-bit I receive the following message:

"You've launched an older version of Firefox
Using an older version of Firefox can corrupt bookmarks and browsing history already saved to an existing Firefox profile. To protect your information, create a new profile for this installation of Firefox.
[Exit] [Create New Profile]

For example https://sede.mjusticia.gob.es/es/
That's the Spanish Government's Ministry of Justice website. While trying to load the browser finds a certificate but it spits SEC_ERROR_UNKNOWN_ISSUER and the web won't go HTTPS.

I guess this won't be the only official website that has this problem.

Firefox is running without admin privileges only on my win7 machine but why not on win10