Okay, so it sounds like a recent update to webkit contains the problem.
(I hardly know what that means butso) I've added webkit to the affected 
packages. Hello webkit folk! Help?

Chris Down: I spent a lot of time moving from Chrome to Chromium to
avoid the bug, only to be chased by it a couple of months later. You may
have the same experience with Firefox. I wish I had just downgraded
Chrome, initially.

** Also affects: webkit (Ubuntu)
   Importance: Undecided
       Status: New

** Description changed:

  I switched to chromium-browser from Google Chrome when, 1-2 months ago,
  Chrome began to misbehave on all pages. It spontaneously jumped to the
  top of the page when I continue scrolling downwards (using a touchpad).
  
   As of a July 1 update to
  chromium-browser:amd64 (50.0.2661.102-0ubuntu0.16.04.1.1237, 
51.0.2704.79-0ubuntu0.16.04.1.1242)
  
- chromium-browser now has the same bug!
+ chromium-browser now has the same bug! Chris Down, below, says the bug
+ is affected most webkit-based apps.
+ 
+ He and I are both on higher-end Lenovo thinkpads (T450s, T460s), (and I
+ believe this also affects T410s -- to confirm)).
  
  To reproduce this, I scroll half-way down a page (using a touchpad?) and
  then click on something (e.g. blank space, which has no effect, or ctrl-
  click on a link to open it in a new tab) with a mouse button.  Next, as
  soon as I touch the touchpad to continue scrolling, the page jumps to
  the top.
  
  Makes browsing near impossible. Very frustrating to have this bug arrive
  at this browser after I already left Chrome (whose latest version on
  Ubuntu also still has this bug) to avoid it.
- 
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: chromium-browser 51.0.2704.79-0ubuntu0.16.04.1.1242
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Uname: Linux 4.4.0-28-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  DRM.card0-DP-1:
   edid-base64:
   dpms: Off
   modes:
   enabled: disabled
   status: disconnected
  DRM.card0-DP-2:
   edid-base64: 
AP///////wAebYhO5woAAAoSAQNqLx546mBFplZKnCUSUFSna4CVD5UAgYCBQHFPAQEBAQEBfC6QoGAaHkAwIDYA2igRAAAaITmQMGIaJ0BosDYA2igRAAAcAAAA/QA4Sx5TDwAKICAgICAgAAAA/ABXMjA1MgogICAgICAgABc=
   dpms: On
   modes: 1680x1050 1680x1050 1280x1024 1280x1024 1440x900 1440x900 1280x960 
1152x864 1024x768 1024x768 832x624 800x600 800x600 800x600 640x480 640x480 
720x400
   enabled: enabled
   status: connected
  DRM.card0-HDMI-A-1:
   edid-base64:
   dpms: Off
   modes:
   enabled: disabled
   status: disconnected
  DRM.card0-HDMI-A-2:
   edid-base64:
   dpms: Off
   modes:
   enabled: disabled
   status: disconnected
  DRM.card0-eDP-1:
   edid-base64: 
AP///////wAGrz0TAAAAACYXAQSVHxF4AoflpFZQniYNUFQAAAABAQEBAQEBAQEBAQEBAQEBFDeAuHA4JEAQED4ANa0QAAAYAAAADwAAAAAAAAAAAAAAAAAgAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTQwSEFOMDEuMyAKAHo=
   dpms: On
   modes: 1920x1080
   enabled: enabled
   status: connected
  Date: Sat Jul  2 21:54:54 2016
  Desktop-Session:
   'ubuntu'
   '/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg'
   
'/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop'
  DetectedPlugins:
  
  EcryptfsInUse: Yes
  Env:
   'None'
   'None'
  InstallationDate: Installed on 2016-02-12 (141 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  Load-Avg-1min: 0.72
  Load-Processes-Running-Percent:   0.1%
  MachineType: LENOVO 20BXCTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic.efi.signed 
root=UUID=ea2fb511-8d62-4b96-bdaa-4b3f7bf79cc6 ro noprompt quiet splash 
vt.handoff=7
  SourcePackage: chromium-browser
  UpgradeStatus: Upgraded to xenial on 2016-05-24 (39 days ago)
  dmi.bios.date: 11/06/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET54WW (1.19 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrJBET54WW(1.19):bd11/06/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BXCTO1WW
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO
  gconf-keys: /desktop/gnome/applications/browser/exec = 
b'firefox\n'/desktop/gnome/url-handlers/https/command = b'sensible-browser 
%s\n'/desktop/gnome/url-handlers/https/enabled = 
b'true\n'/desktop/gnome/url-handlers/http/command = b'sensible-browser 
%s\n'/desktop/gnome/url-handlers/http/enabled = 
b'true\n'/desktop/gnome/session/required_components/windowmanager = 
b''/apps/metacity/general/compositing_manager = 
b''/desktop/gnome/interface/icon_theme = 
b'gnome\n'/desktop/gnome/interface/gtk_theme = b'Clearlooks\n'
  modified.conffile..etc.default.chromium-browser: [deleted]

** Description changed:

  I switched to chromium-browser from Google Chrome when, 1-2 months ago,
  Chrome began to misbehave on all pages. It spontaneously jumped to the
  top of the page when I continue scrolling downwards (using a touchpad).
  
   As of a July 1 update to
  chromium-browser:amd64 (50.0.2661.102-0ubuntu0.16.04.1.1237, 
51.0.2704.79-0ubuntu0.16.04.1.1242)
  
- chromium-browser now has the same bug! Chris Down, below, says the bug
- is affected most webkit-based apps.
+ chromium-browser now has the same bug! Chris Down, in comments below,
+ says the bug is affecting most webkit-based apps.
  
  He and I are both on higher-end Lenovo thinkpads (T450s, T460s), (and I
  believe this also affects T410s -- to confirm)).
  
  To reproduce this, I scroll half-way down a page (using a touchpad?) and
  then click on something (e.g. blank space, which has no effect, or ctrl-
  click on a link to open it in a new tab) with a mouse button.  Next, as
  soon as I touch the touchpad to continue scrolling, the page jumps to
  the top.
  
  Makes browsing near impossible. Very frustrating to have this bug arrive
  at this browser after I already left Chrome (whose latest version on
  Ubuntu also still has this bug) to avoid it.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: chromium-browser 51.0.2704.79-0ubuntu0.16.04.1.1242
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Uname: Linux 4.4.0-28-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  DRM.card0-DP-1:
   edid-base64:
   dpms: Off
   modes:
   enabled: disabled
   status: disconnected
  DRM.card0-DP-2:
   edid-base64: 
AP///////wAebYhO5woAAAoSAQNqLx546mBFplZKnCUSUFSna4CVD5UAgYCBQHFPAQEBAQEBfC6QoGAaHkAwIDYA2igRAAAaITmQMGIaJ0BosDYA2igRAAAcAAAA/QA4Sx5TDwAKICAgICAgAAAA/ABXMjA1MgogICAgICAgABc=
   dpms: On
   modes: 1680x1050 1680x1050 1280x1024 1280x1024 1440x900 1440x900 1280x960 
1152x864 1024x768 1024x768 832x624 800x600 800x600 800x600 640x480 640x480 
720x400
   enabled: enabled
   status: connected
  DRM.card0-HDMI-A-1:
   edid-base64:
   dpms: Off
   modes:
   enabled: disabled
   status: disconnected
  DRM.card0-HDMI-A-2:
   edid-base64:
   dpms: Off
   modes:
   enabled: disabled
   status: disconnected
  DRM.card0-eDP-1:
   edid-base64: 
AP///////wAGrz0TAAAAACYXAQSVHxF4AoflpFZQniYNUFQAAAABAQEBAQEBAQEBAQEBAQEBFDeAuHA4JEAQED4ANa0QAAAYAAAADwAAAAAAAAAAAAAAAAAgAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTQwSEFOMDEuMyAKAHo=
   dpms: On
   modes: 1920x1080
   enabled: enabled
   status: connected
  Date: Sat Jul  2 21:54:54 2016
  Desktop-Session:
   'ubuntu'
   '/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg'
   
'/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop'
  DetectedPlugins:
  
  EcryptfsInUse: Yes
  Env:
   'None'
   'None'
  InstallationDate: Installed on 2016-02-12 (141 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  Load-Avg-1min: 0.72
  Load-Processes-Running-Percent:   0.1%
  MachineType: LENOVO 20BXCTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-28-generic.efi.signed 
root=UUID=ea2fb511-8d62-4b96-bdaa-4b3f7bf79cc6 ro noprompt quiet splash 
vt.handoff=7
  SourcePackage: chromium-browser
  UpgradeStatus: Upgraded to xenial on 2016-05-24 (39 days ago)
  dmi.bios.date: 11/06/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET54WW (1.19 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrJBET54WW(1.19):bd11/06/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BXCTO1WW
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO
  gconf-keys: /desktop/gnome/applications/browser/exec = 
b'firefox\n'/desktop/gnome/url-handlers/https/command = b'sensible-browser 
%s\n'/desktop/gnome/url-handlers/https/enabled = 
b'true\n'/desktop/gnome/url-handlers/http/command = b'sensible-browser 
%s\n'/desktop/gnome/url-handlers/http/enabled = 
b'true\n'/desktop/gnome/session/required_components/windowmanager = 
b''/apps/metacity/general/compositing_manager = 
b''/desktop/gnome/interface/icon_theme = 
b'gnome\n'/desktop/gnome/interface/gtk_theme = b'Clearlooks\n'
  modified.conffile..etc.default.chromium-browser: [deleted]

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https://bugs.launchpad.net/bugs/1598519

Title:
  regression: page scrolling jumps to top of page spontaneously

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