> Do you use hintfull in your fontconfig hintstyle settings?

No. I have a powerline config in my fontconfig conf directory though,
which contains

```xml
 <match target="font">
  <edit name="hinting" mode="assign">
   <bool>false</bool>
  </edit>
 </match>
 <match target="font">
  <edit name="hintstyle" mode="assign">
   <const>hintnone</const>
  </edit>
 </match>
 <match target="font">
  <edit name="rgba" mode="assign">
   <const>bgr</const>
  </edit>
 </match>
 <match target="font">
  <edit name="antialias" mode="assign">
   <bool>true</bool>
  </edit>
 </match>
```
I'm attaching the full file just in case, and I'm going to test stuff with it.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1883369

Title:
  Weird font rendering on certain website with firefox

Status in Mozilla Firefox:
  Confirmed
Status in firefox package in Ubuntu:
  New

Bug description:
  When hovering some elements, some letters moves slightly. A gif
  explains better than words here:

  https://trancart.eu/lutim/l7qWMFQF/7Q9YJRUn.gif

  I reproduce this at least on twitter and gitlab.com, but I remember
  having it on other websites.

  
  My OS: kubuntu 20.04

  Reproduced on both firefox dev edition and firefox from apt package.

  Sorry in advance if it is not the correct place, I have no idea where
  to report that.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: firefox 77.0.1+build1-0ubuntu0.20.04.1
  ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
  Uname: Linux 5.4.0-33-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  augustin   4577 F.... pulseaudio
  BuildID: 20200602222727
  CasperMD5CheckResult: skip
  Channel: Unavailable
  CurrentDesktop: KDE
  Date: Sat Jun 13 16:14:37 2020
  DefaultProfileExtensions: extensions.sqlite corrupt or missing
  DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  DefaultProfileLocales: extensions.sqlite corrupt or missing
  DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:731
  DefaultProfilePrefSources: prefs.js
  DefaultProfileThemes: extensions.sqlite corrupt or missing
  EcryptfsInUse: Yes
  ExecutablePath: /usr/lib/firefox/firefox
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2016-11-10 (1310 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  IpRoute:
   default via 192.168.0.254 dev enp0s31f6 proto dhcp metric 100 
   10.0.3.0/24 dev lxcbr0 proto kernel scope link src 10.0.3.1 linkdown 
   169.254.0.0/16 dev docker0 scope link metric 1000 linkdown 
   172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 
   192.168.0.0/24 dev enp0s31f6 proto kernel scope link src 192.168.0.4 metric 
100
  MostRecentCrashID: bp-9faa8c77-de9e-4f98-9e75-033440200610
  Profile1Extensions: extensions.sqlite corrupt or missing
  Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  Profile1Locales: extensions.sqlite corrupt or missing
  Profile1PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:731
  Profile1PrefSources: prefs.js
  Profile1Themes: extensions.sqlite corrupt or missing
  Profile2Extensions: extensions.sqlite corrupt or missing
  Profile2IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  Profile2Locales: extensions.sqlite corrupt or missing
  Profile2PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:731
  Profile2PrefSources: prefs.js
  Profile2Themes: extensions.sqlite corrupt or missing
  Profile3Extensions: extensions.sqlite corrupt or missing
  Profile3IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  Profile3Locales: extensions.sqlite corrupt or missing
  Profile3PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:731
  Profile3PrefSources: prefs.js
  Profile3Themes: extensions.sqlite corrupt or missing
  Profile4Extensions: extensions.sqlite corrupt or missing
  Profile4IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  Profile4Locales: extensions.sqlite corrupt or missing
  Profile4PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:731
  Profile4PrefSources: prefs.js
  Profile4Themes: extensions.sqlite corrupt or missing
  Profiles:
   Profile3 - LastVersion=68.0/20190627143605 (Out of date)
   Profile1 - LastVersion=78.0/20200609215727 (Out of date)
   Profile0 (Default) - LastVersion=77.0.1/20200602222727 (In use)
   Profile2 - LastVersion=60.5.2/20190221164337 (Out of date)
   Profile4 - LastVersion=72.0.1/20200107212822 (Out of date)
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  UpgradeStatus: Upgraded to focal on 2020-05-09 (34 days ago)
  dmi.bios.date: 05/17/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1FET51W (1.25 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FBCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1FET51W(1.25):bd05/17/2017:svnLENOVO:pn20FBCTO1WW:pvrThinkPadX1Carbon4th:rvnLENOVO:rn20FBCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 4th
  dmi.product.name: 20FBCTO1WW
  dmi.product.sku: LENOVO_MT_20FB_BU_Think_FM_ThinkPad X1 Carbon 4th
  dmi.product.version: ThinkPad X1 Carbon 4th
  dmi.sys.vendor: LENOVO

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