(resending since I did it wrong before and only Itai saw this)

On Tue, Jan 13, 2009 at 12:28 PM, Itai <[email protected]> wrote:

> In Chrome, the thumbnail added could easily be the same
> thumbnail we use for the most visited pages in the New Tab Page.


Note that most people expect the tab preview to be a *current* snapshot of
the page, which this image would not be.

The most important question is: Can someone find a reason why this
> would hinder usability? That is, if we added this feature, would there
> be a compelling reason to turn it off?


Yes.  We tested this pretty heavily a year or so ago; various people
installed different Tab Preview extensions for Firefox.  Unilaterally we
found that the feature was very cool for a brief period of time, then
quickly became somewhere between useless and annoying.

There were numerous reasons for this:
* If the tab preview was set to appear on the standard tooltip timer, it was
both faster and more informative to simply click on the tab you were
hovering to get a full-size image.
* But if the preview was set to appear instantly, the UI felt
extraordinarily distracting, since tab previews are moderately heavyweight
yet were extremely transient.  Random mouse movements caused distracting UI
to appear, and even attempting to move to a desired tab became frustrating.
* Even when the preview UI itself was not annoying, previews were rarely
large enough to provide better information than the tab favicon in a
compelling enough way to prefer them over simply clicking the tab.
 Frequently we squinted at the preview, then clicked the tab to check what
it really was, with the net result being a pure time loss.

In short, I can think of no use cases that tab previews make better, and a
lot that were concretely worse when we used it.  I cannot think of an
alternative design which would overcome both these difficulties, although
perhaps one exists.

Being partial to Tab Previews, my personal take is that the preview
> itself is extremely useful because titles quickly become too small to
> display with 10 to 20 tabs and that this feature helps identify tabs
> quickly.


Note that this use case could perhaps be solved much better with a "tab
switcher"/tab exposé (sorry Apple) sort of system, which could provide the
sort of information a preview could, but for a large set of tabs at once.

I think this particular area holds much more promise, though it is also one
we've struggled to create successful prototypes for in the past.

For previously visited links for example. It happens that I go back to
> a page and forgot which link had what I was looking for. If hovering
> over a visited link, it would be a lesser problem. It would not be
> done for non-visited links for latency issues and not to trigger
> unwanted requests.


This is somewhat more compelling than the tabstrip case, though JS-based
implementations on websites feel pretty frustrating to me, primarily because
mouse hover on content is rarely a good indicator of my attention (and thus
when something happens on hover I am surprised).

Again, the contrast should be, is the alternative we're proposing
monotonically better than simply clicking (or middle-clicking) the link in
question to see what it is?

Bookmarks are another place where previews would be very useful, if I
> don't bother editing bookmark titles, a lot of bookmarks end up with
> similar titles like 'homepage' or 'welcome'. Yahoo's bookmarking
> service offers such previews based on when they last crawled the site.
>

Yes, this seems like a natural place to expose a thumbnail.

PK

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