How to open link in FF portable?

A general solution to the problem of reassignement of the drive letter is to use dos subst command.

Generally there are a lot of unused drive letters that you can use for this.
So

subst "An unused drive letter letter": "Your portable drive letter":\

does the job.

I use this solution so I can compare my portable apps installation with a backup copy using beyond compare without fake alarms of change due to the reassignement of drive letter.
Generally the A: and B: drive letters are always free (has anybody a floppy today?) , so I use

subst a: "my portable usb disk letter":\

and I see all in A:

Only issue is if you use free A: and B: drive letters is that seems that files are deleted directly without pass from the recycle bin. (But I haven't seriously investigated this fact )

I have a batch cmd file that does the substitution and then it starts some portableapps stuff.
(You can see an extract below)
-----------------------------------------------

echo off

setlocal

echo "drive replacement"
subst a: f:\

echo "start PortableApps"
start "PortableApps" /B "A:\_PortableApps\Start.exe"

echo "check for update"
start "PortableAppsUpdate" /B "A:\_PortableApps\PortableApps\PortableApps.com\PortableAppsUpdater.exe" /STARTUP=false /MODE=UPDATE /KEYBOARDFRIENDLY=false /HIDEPORTABLE=true /BETA=true /CONNECTION=Automatic

:PROMPT

SET /P AREYOUSURE=Continue ([y]/n)? || SET AREYOUSURE=y

IF /I "%AREYOUSURE%" NEQ "y" GOTO END

echo "start Skype"
start "Skype" /B "A:\_PortableApps\PortableApps\SkypePortable\SkypePortable.exe"

echo "start Firefox"
start "Firefox" /B "A:\_PortableApps\PortableApps\FirefoxPortable\FirefoxPortable.exe"

echo "start Thunderbird"
start "Thunderbird" /B "A:\_PortableApps\PortableApps\ThunderbirdPortable\ThunderbirdPortable.exe"

:END

echo "exit"
exit