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I'm actually disappointed that I wasn't one of those who received this added protection.
If there was a way, you could have my copy as well as that from DavidR!
There are several issues here:
Is what Avast has done lawful? That (probably) depends on the legislation in force where the user is located. However I very much doubt that anyone would prosecute them anywhere.
Is what Avast has done compatible with the EULA? I have seen Eddy's view (and others) that it is compatible with the EULA. However I'm with those who disagree.
Regardless of the answers to the 2 questions above, was it sensible or good practice for Avast to have put it on people's machines without seeking explicit approval? No
Is the browser any use (to me)? Not for banking as mine wants Trusteer Rapport and I haven't found a way of getting that into the browser (indeed I don't think the two are compatible). Nor does it appeal for general browsing without a number of add-ons, which again I can't put in.