Re: Firefox: zoom changes page position

This is a know issue :

	https://bugzilla.mozilla.org/show_bug.cgi?id=64926

You may vote for it; but crossing fingers might help too, as this issue
was created 8 years ago. I am annoyed too.

On 30.10.2009 20:45, Jeff wrote:
> I use Firefox for Windows (XP, SP3). However, I suspect this behavior is
> the same in all Mozilla browsers that include a zoom feature.
> 
> Particularly in the middle of long pages, and especially with those that
> contain mostly text, changing either zoom setting (full or text) changes
> the relative vertical position of the page-- that is to say, the
> vertical portion of the page displayed in the browser window changes
> when the zoom setting is changed. With particularly long pages (book
> length, or even the length of a short story), a zoom setting change of
> only 5% will displace the vertical position of the page by several
> windows worth (even with Mozilla running full screen). Compare this
> behavior to that of Adobe Acrobat, which maintains the same page and
> relative vertical position on it when the zoom setting is changed.
> (Acrobat can be made to capture a web page as one [or sometimes several]
> long continuous page[s]. When displaying such PDF files, Acrobat is
> still able to maintain the relative page position when the zoom setting
> is changed.)
> 
> This behavior in Mozilla reduces the value of the zoom feature (although
> I suppose the situation could be worse-- I just discovered that IE 7
> repositions to the top of the page when the zoom is changed). It also
> reduces the value of 'Dog Ears'
> (https://addons.mozilla.org/en-US/firefox/addon/4482
> http://yellow5.us/firefox/dogears/),
> a Firefox extension that allows the user to place index marks on pages
> and then seek back to them later (which provides a "bookmark" for
> specific content on long pages). Since 'Dog Ears' stores the absolute
> vertical position of index marks (probably distance from the top of the
> page), their positions relative to the page content changes if the zoom
> setting is changed. Many users asked the author about this problem in a
> forum (which I cannot seem to find, now), and he replied that the only
> other solution was to associate the index marks with content, which
> seemed unreliable.
> 
> My wish for the wish list, then: When a Mozilla browser is displaying
> somewhere in the middle of a web page, whatever is being displayed at
> the vertical center of the window will still be displayed there when the
> zoom setting is changed. Hopefully, whatever mechanism is developed to
> achieve that can also be made accessible to add-on authors, so that
> extensions like 'Dog Ears' are still useful when the zoom setting is
> changed.
> 
> That will probably be some work, and I wish I could contribute some
> code, but my experience is limited to writing shell scripts, and simple
> command line utilities in C. I hope I can persuade Mozilla developers to
> take it up, as the zoom feature is not really fully functional without it.
> 
> Thanks for listening,
> 
> Jeff