Daniel <[email protected]> wrote:
> MCBastos wrote:
>> Interviewed by CNN on 29/01/2013 10:47, Daniel told the world:
>>> Rob wrote:
>>>> Ray_Net <[email protected]> wrote:
>>>>> 2. A firefox guy is complaining about lag when accessing web pages ..
>>>>> could this feature slow firefox.
>>>>
>>>> This is not very likely.  The feature works by downloading a list
>>>> of infected sites at a certain interval, then storing this list
>>>> in a local file.  The file is then consulted during browsing.
>>>>
>>>> So there is no extra query to a single server that has to reply before
>>>> a page is shown, like in some competing system.
>>>
>>> Hey, Rob, in your first para, you say that a list is downloaded, so in
>>> your second para, you *must be wrong* when you state there is "no extra
>>> query to a single server that has to reply".
>>>
>>> Of course, this extra wait time will depend on how often SM has to
>>> download the list of infected sites, daily, weekly, whatever.
>>
>> No, you missed the rest of the sentence: "...that has to reply before a
>> page is shown."
>>
>> What Rob meant is that Firefox won't stop loading the page you want to
>> visit while checking a particular server to see if that page is clean.
>> Instead, it has a previously-downloaded blacklist of problem sites.
>
> So, e.g. Yesterday SM downloaded a list. The site I am now visiting was 
> not on that list, however this site may have been added to the list 
> overnight, so I've been phished/spammed/whatever, even though I was 
> doing the right thing!!
>
> Some protection, maybe, but not total!!

Yes.  That is how it always is.  You can never get total protection
from a system like this.

Even with a system that queries an online server, you have the problem
that you may visit a site that is not yet known to serve malware, so
the server says "OK" and you get infected anyway.

It is the same with virus scanners.  That is why it is always better
to setup the system in such a way that software cannot be installed
or run as downloaded by the logged-in user.  Use a separate account
for surfing and for administering the system (installing software).
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