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FF 39.0.3 won't allow reinstall of uninstalled DnG search engine.
Hi,
FF 39.0.3 won't allow reinstall of uninstalled DnG search engine.
I previously uninstalled DnG search eng several mo ago. Now I tried to install DnG, in FF 39.0.3 and FF said it was already installed.
My question is: How do uninstall an add on that has been previously uninstalled so I can instal a newer version?
The inserted image below should explain it all: