build 20020800908 Windows XP, classic Theme New Logitech cordless optical mouse with mouseware 9.61.156 Mozilla mouse wheel settings: - No modifier key: scroll the document by 6 lines - control: make the text larger or smaller Mouseware settings: - buttons: - wheel set as "middle button" - scrolling set at 6 lines - "use MS office compatible scrolling" is unchecked Steps to reproduce the bug : - go to a text page, text is at 100% - ctrl+wheelscroll one wheel step (forward or backward), text siez is set to 80% or 120% Reproducable : always Expected result: text should increase/decrease with 10% steps like my old Logitech regular mouse used to do Actual result: 20% steps Observations : - if I set scrolling to "none" in MouseWare, I get 10% steps in Mozilla but the problem is that mouse-wheel scrolling becomes unavailable in all other applications. - Setting the mouse-wheel as a middle button in Mouseware is the only way to enable middle-button clicking on links, hence the choice. - I also notice that scrolling in Mozilla doesn't seem as precise and reliable as it used to be with my old mouse. I set a 6 lines scrolling step but I sometimes get the impression that it is a 5 or 7 step. I think that Mozilla and mouseware are someway interfering.

*** Bug 162030 has been marked as a duplicate of this bug. ***

see bug 20618

I found out a very strange thing about it, I know of one page that behaves correctly (10% increase/decrease), it is the bug report 109551 !! BTW, I put the bug in the Browser component, but it is also visible in the mail window.

Confirmed, because of the dup. ->bryner, as he owns 20618 also. pascal.chevrel: if you check "MS office compatibility settings" in mouseware, does the same problem appear?

I have totally uninstalled mouseware and use WinXP generic driver which works fine (using the mouse wheel in Mozilla is more important to me than using mouseware options). If I remember correctly, the MS Office compatibility setting didn't change anything, I would have to reinstall mouseware. There is a new version of mouseware (9.73), I will probably try this week-end.

The problem is fixed with logitech driver 9.76.