See:

• http://wiki.mozilla.org/Gecko:Mouse_Wheel_Scrolling#Mozilla_17_.28Firefox_17.29_or_later

In this link I read : Customizing default action of "wheel" event. The value 0 means "Do nothing", 1 means "Scroll contents", 2 means "Go back or forward in the history", 3 means "Zoom in or out the contents".

mousewheel.default.action = 1 in my config...

The last line in the firefox 17 paragraph is : "On Linux, the scroll unit is always by line. "

I do not understand the paragraph (my english and my knowledges...). Does this mean that there is no content scroll on linux ?

Thanks

The delta_multiplier are internally floats of type double and are converted to an integer for storing in a pref by multiplying them with 100 and are acting as percentages of the default scroll amount (i.e. 100 -> 1).

Set the mousewheel.default.delta_multiplier_y pref to 33 to change the scroll behavior from 3 lines to 1.

You can also try this:

• mousewheel.system_scroll_override_on_root_content.enabled -> true

Nothing changes with the last try.

Do you know if it works on linux ? Maybe the problem is only for me... But I tested on 2 systems with several logins... [edit] and with firefox and seamonkey...

Maybe reserve the Shift modifier for this.

• mousewheel.with_shift.action;<strike>2</strike> 1
• mousewheel.with_shift.delta_multiplier_y;9999

(edit: fixed action value from 2 to 1)

a typo : mousewheel.with_shift.action;1

It's a good workaround ; the arrows of the scroll bar still work.

I think I will report a bug and the developers will decide if it is a real problem.

Thanks Core-el for your answers. It's a real help and you have found a good workaround. Thanks.

You're welcome

Oops, I copied the pref setting from the wrong Firefox instance (I had two extra copies open and had tested this in one).

See also:

• bug 801101 - Needs a option to scroll over one page

With your workaround and the bug 801101 you give the solution : mousewheel.default.delta_multiplier_y;9999 with the setting "scroll content" mousewheel.default.action;1

This works !

I also deleted 3 old configs that are not automatically deleted : mousewheel.withnokey.action;1 mousewheel.withnokey.numlines;10 mousewheel.withnokey.sysnumlines;false I don't know if it is important but if somebody read this thread it will maybe help.

Setting the multiplier seems needed. mousewheel.withnokey.action;1 has not the correct behavior alone. In seamonkey, "preferences/advanced/mouse wheel/scroll the document" does not set the multiplier so it does not work. It works after setting the multiplier manually.

I can again scroll big documents or photo galleries easily ! :)

I was unable to find a solution alone even reading on the net. That's why I was ready to report a bug.

Thanks Cor-el for finding a solution ! :):):)

You're welcome and thanks for reporting your findings.