Firefox Portable

v67 added support for running Multiple Instances:

A myriad of new features help make Firefox easier to use:
Users will be able to run different Firefox installs side by side by default so that you can run the beta and release versions simultaneously

https://www.mozilla.org/en-US/firefox/67.0/releasenotes/

I have been using Firefox Portable on Windows for years, set as the system's default browser.
A few days ago I updated to version 67 (Developer edition), and I noticed the following:
when I click on a link from another application (for example a Thunderbird email) then Firefox starts but it uses a new profile (instead of my profile).
This is annoying beacuse I don't have access to bookmarks/extensions in this profile. In previous versions it would get launched with my profile.
Does it happens to you guys? Any workaround?

This problem have happen after the fiasco of Add-On in Firefox. I have install a new Portable Firefox ver. 66.0.4, after open it, it is automatically updated itself before i know it. After restarting the browser can't be open anymore if i don't click yes to temporarily copied to local hard drive on dialog box that appear saying "the browser appears to be running from a location that is read-only. Would you like to temporarily copy it to the local hard drive and run it from there?" If i click yes and open the browser, it seem the browser have broken. Bookmarks can't be saved and imported.

I request the update of Mozilla Firefox 66.0.5.

When I move the portable firefox directory to a new location, after restarting Firefox, the addons icons menu bar has gone.
I can still access the addons through the Tools>Extensions menu and see that they are still installed. However, I cannot access the options for them that way.

Is there a file where the location of extensions/addon icons or shortcuts is stored that is maybe not getting rewritten when I transfer the portable firefox directory to another location or usb drive?

Many thanks.

Good day. While updating my Firefox ESR portable, it crashed doing the update.
I submitted the report. But now I can't find it. Where is it?

This happens just after the add-on certificate problem updates went out.

I was just stepping through my Options settings after the install of Firefox Portable 66.0.4 and noticed that 66.0.4 had in the 'General' settings enabled the setting "Automatically install updates (recommended)". I never ever allow Firefox Portable to do that, I only ever use the setting "Check for updates but let you choose to install them". So 66.0.4 must have reset that setting to the Mozilla default on install.

Same thing happened in my fully installed Firefox 66.0.4.

Hello, I am unable to find the legacy versions of Firefox Developer Edition. https://portableapps.com/apps/internet/firefox-developer-portable
I know where the legacy versions of other builds are. Does anyone know where those are archived once a new version comes out?
Thank you.

http://forums.mozillazine.org/viewtopic.php?f=38&t=3049775
http://forums.mozillazine.org/viewtopic.php?f=38&t=3049746

Since no one else has mentioned it that I have found, it may somehow just be me, but after the latest update (file version 2.1.4.0, 66.0.3), PP Firefox will not load Gmail, as it did before the update. It just goes to a blank, white screen.

Win 10 64-bit
Same USB, E:\PortableApps\FirefoxPortable
Same computer

Haven't tried it on different machine yet. I will update if it is machine-specific.

Update: It is not machine-specific. It is showing a white blank screen for Gmail on all machines.