Comment 0 for bug 207454

User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0

The page at http://v2archive.v2.nl/~portal2004/moz-slow.html is really slow and
unresponsive, sometimes firefox get's so unresponsive it asks me to force-quit.
Using the scrollbar takes a long time, while the processor runs at 100% all the
time.

Older versions of Firefox don't have this problem. It seems to occur when
mozilla revision version is greater than 1.6, So try to load the page with an
older version (< rv1.7) and there are no problems at all.

The page uses the following css style:
<style type="text/css">
/* safari1.2 bug default everything to opaque */
/* safari1.2 needs opacity:.99 instead of 1 */
body * { filter:alpha(opacity=100);-moz-opacity:1;opacity:.99;-khtml-opacity:1; }*/
</style>

It seems specifying opacity as a float (.99) doesn't work well with new versions
of moz/firefox. Maybe this is considered bad web design, however I post this as
a bug, because old firefox/mozilla versions have no problems with this, only new
versions have.

Reproducible: Always

Steps to Reproduce:
1. start mozilla/firefox rv version > 1.6
2. go to http://v2archive.v2.nl/~portal2004/moz-slow.html
3. try using the scrollbar

Actual Results:
Mozilla is real slow with loading the page, scrolling is very jerky and
processor intensive, mozilla can become unresponsive

Expected Results:
Render the page in the same time as older browser versions do, which should be
the same time it takes to load http://v2archive.v2.nl/~portal2004/moz-normal.html
(this is the same file without the CSS:opacity)

This behovior is shown on all platforms (tested on Linux,Mac,Windows), using
gecko engine revision > 1.6