This is basically a duplicate of 4638016 except that it applies to Mozilla and
Netscape rather than I.E.
Using the 1.4.1 plug-in (which fixes 4638016 for I.E.) it is still possible to
lose focus when running an applet inside a Mozilla or Netscape browser.
If you give an applet focus the applet will lose focus if you switch to
another window then back to the browser (either by clicking or alt-tabbing).
You can probably illustrate this using most applets but the examples I used
are http://csis.pace.edu/~bergin/Java/applets.htm
There are subtle browser differences. With Netscape 7 on Solaris the applet
regains focus when you move the cursor into the area occupied by the applet.
With Mozilla on Windows you have to explicitly click inside the applet area
to regain focus. Another problem with Mozilla on Windows is that the TAB key
does not switch focus between TextFields within the applet, but this feature
does work on Solaris (please let me know if I need to file a separate bug
for this TAB problem).