New comment by svenper on void-packages repository

https://github.com/void-linux/void-packages/issues/12885#issuecomment-513412277
Comment:
@jnbr What arch are you on?

```
(firefox:29867): Gtk-WARNING **: 01:31:54.165: Theme parsing error: gtk.css:3:2: Invalid name of pseudo-class
1563579114583   addons.webextension.screenshots@mozilla.org     WARN    Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: mozillaAddons
1563579114583   addons.webextension.screenshots@mozilla.org     WARN    Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: telemetry
1563579114583   addons.webextension.screenshots@mozilla.org     WARN    Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: resource://pdf.js/
1563579114583   addons.webextension.screenshots@mozilla.org     WARN    Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: about:reader*
Sandbox: seccomp sandbox violation: pid 29952, tid 29952, syscall 16, args 2 21523 140724365074336 0 140324000936204 16.
(/usr/lib/firefox/firefox:29952): Gtk-WARNING **: 01:31:55.298: Theme parsing error: gtk.css:3:2: Invalid name of pseudo-class
Sandbox: seccomp sandbox violation: pid 29975, tid 29975, syscall 16, args 2 21523 140733141244480 0 140434539462924 16.
(/usr/lib/firefox/firefox:29975): Gtk-WARNING **: 01:31:55.511: Theme parsing error: gtk.css:3:2: Invalid name of pseudo-class
JavaScript error: chrome://browser/content/aboutPrivateBrowsing.js, line 11: ReferenceError: RPMIsWindowPrivate is not defined
Sandbox: seccomp sandbox violation: pid 30030, tid 30030, syscall 16, args 2 21523 140729510399344 0 139633561719052 16.
(/usr/lib/firefox/firefox:30030): Gtk-WARNING **: 01:31:56.019: Theme parsing error: gtk.css:3:2: Invalid name of pseudo-class
console.warn: nsLoginManager: "searchLogins: `formSubmitURL` or `httpRealm` is recommended"
[Parent 29867, Gecko_IOThread] WARNING: pipe error (65): Connection reset by peer: file /builddir/firefox-68.0/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 358
[Parent 29867, Gecko_IOThread] WARNING: pipe error (87): Connection reset by peer: file /builddir/firefox-68.0/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 358
[Parent 29867, Gecko_IOThread] WARNING: pipe error (80): Connection reset by peer: file /builddir/firefox-68.0/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 358
###!!! [Parent][MessageChannel] Error: (msgtype=0x1E0074,name=PBrowser::Msg_StopIMEStateManagement) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x1E008F,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv
###!!! [Parent][MessageChannel] Error: (msgtype=0x1E008F,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv
[Parent 29867, Gecko_IOThread] WARNING: pipe error (69): Connection reset by peer: file /builddir/firefox-68.0/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 358
```

The mentions of chromium are interesting. It was running when I started firefox.