are these add-ons portable compatible?

But for Download Helper you have to tweak it a bit, because it saves it info on [drive letter]:/Documents and Settings/[user]/dwhelper.
You can tweak it changing were it saves it info on its options.
You can chose a folder and then, if you're using it on a portable device remove the drive letter, ex:

imagine that you saved it to:
"F:\PortableApps\dwhelper" for example

for saving always to that folder on other computers just remove the drive letter:
"\PortableApps\dwhelper"

that will make that download helper saves it settings to that folder on the drive were it is.

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