This parasite is a major problem for the Firefox browser.
The access of a secure https site was impossible.
So if banking had to be done, the only solution was with another browser that was not contaminated.
I made a scan on "dealply" and every hit was removed, but the result for the problem was zero. However the scan produce the update date as well.
So selecting a restart point chosen for this date. That did the trick and delply was removed.
Reinstalling Firefox does not work either, so choose for recovery.
What I recommend make a regular restart point even if you don’t really needed, here it is the solution, and I expect more of this nonsense in the future.
Sorry for my bad English but a good chance you understand the message.
And again after a day, "dealply" is sitting there again, is more like a virus.
The solution was not what I expected.