Unable to scroll by 1 pixel (Alt+mouse wheel) anymore (after updating FF from 12.0 to 20.0.1) - is there a solution without add-ons?
Since I need scrolling of browser's window by one pixel, in FF 12.0 I was using:
mousewheel.withaltkey.action = 4
mousewheel.withaltkey.numlines = 1
mousewheel.withaltkey.sysnumlines = false
and I was able to use the Alt+mouse wheel to scroll the contents by only 1 pixel.
However, after updating FF to 20.0.1 Alt+mouse wheel stopped to work so I am trying to re-enable the functionality but without success. I see there were some changes starting from FF 17:
https://wiki.mozilla.org/Gecko:Mouse_Wheel_Scrolling
Scrolling by pixel seem to be now removed from preferances, action = 4 was once 'Scroll document by a number of pixels (given by the numlines property) ' and now it says:
'Note that unlike 16 or earlier, you cannot specify the unit of delta values such as scrolling by pixel, line or page. I.e., you cannot specify the deltaMode value of DOM WheelEvent with any preferences. On Windows, the scroll unit is by line or page with mouse wheel.'
Is there a solution to re-enable scroll by one pixel without installing add-ons (every add-on for smooth scrolling changes some other behavior)?
Modified by Chupo_cro
Chosen solution
There have been changes to the mousewheel prefs as the consequence of implementing DOM3 mouse wheel scrolling (Bug 719320).
I don't think that it is possible to override / set the scroll amount when using a modifier key to a specific number of pixels.
There are only delta multipliers that modify the number of lines (33 changes the scroll amount to one third), so probably the closed that you can get is to set the action for the Alt modifier to 1 (i.e. 1% of the default).
You can modify mousewheel.*.delta_multiplier_y prefs (vertical Y-axis) to change the vertical scroll amount.
- mousewheel.system_scroll_override_on_root_content.enabled -> true
- mousewheel.with_control.delta_multiplier_y
All Replies (4)
Hello,
Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
Then perform these steps:
- Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
- In the Firefox options window click the Advanced tab, then select "General".
- In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.
- Now, restart Firefox and see if the problems persist.
Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:
Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
Upgrade your graphics drivers to use hardware acceleration and WebGL
Did this fix your problems? Please report back to us!
Thank you.
In order to be able to find the correct solution to your problem, we require some more non-personal information from you. Please do the following:
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Thanks in advance for your help!
Chosen Solution
There have been changes to the mousewheel prefs as the consequence of implementing DOM3 mouse wheel scrolling (Bug 719320).
I don't think that it is possible to override / set the scroll amount when using a modifier key to a specific number of pixels.
There are only delta multipliers that modify the number of lines (33 changes the scroll amount to one third), so probably the closed that you can get is to set the action for the Alt modifier to 1 (i.e. 1% of the default).
You can modify mousewheel.*.delta_multiplier_y prefs (vertical Y-axis) to change the vertical scroll amount.
- mousewheel.system_scroll_override_on_root_content.enabled -> true
- mousewheel.with_control.delta_multiplier_y
That's it!! Thank you very much for your help!! I've changed the delta_y to:
mousewheel.with_alt.delta_multiplier_y = 2
and now I can again scroll by 1 pixel the same way as before updating the FF (with Alt+mouse wheel).
delta_y = 1 was to low - I had to turn the wheel 2 or 3 times to scroll by 1 pixel, then I tried 5, 4, 3 and 2 and 2 seems to be the best match.
Thank you again,
Regards