firefox.desktop contains a deprecated OnlyShowIn key in desktop actions

[Serhiy]

See the output below. That prevents it to be shown in KDE "Icon-Only Task Manager" actions.

$ desktop-file-validate /usr/share/applications/firefox.desktop
/usr/share/applications/firefox.desktop: warning: key "OnlyShowIn" in group "Desktop Action NewWindow" is deprecated
/usr/share/applications/firefox.desktop: warning: key "OnlyShowIn" in group "Desktop Action NewPrivateWindow" is deprecated

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 50.1.0+build2-0ubuntu0.16.04.1 [modified: usr/share/applications/firefox.desktop]
ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
Uname: Linux 4.4.0-57-generic x86_64
NonfreeKernelModules: wl
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: int 1774 F...m pulseaudio
 /dev/snd/controlC0: int 1774 F.... pulseaudio
BuildID: 20161209095719
Channel: Unavailable
CurrentDesktop: KDE
Date: Tue Jan 3 17:51:49 2017
DefaultProfileExtensions: extensions.sqlite corrupt or missing
DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
DefaultProfileLocales: extensions.sqlite corrupt or missing
DefaultProfilePlugins:
 Google Talk Plugin - /opt/google/talkplugin/libnpgoogletalk.so (google-talkplugin)
 Google Talk Plugin Video Renderer - /opt/google/talkplugin/libnpo1d.so (google-talkplugin)
 Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin)
DefaultProfilePrefSources:
 prefs.js
 [Profile]/<email address hidden>/defaults/preferences/prefs.js
DefaultProfileThemes: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IpRoute:
 default via 192.168.0.1 dev wlp3s0 proto static metric 600
 169.254.0.0/16 dev wlp3s0 scope link metric 1000
 192.168.0.0/24 dev wlp3s0 proto kernel scope link src 192.168.0.101 metric 600
Profile1Extensions: extensions.sqlite corrupt or missing
Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile1Locales: extensions.sqlite corrupt or missing
Profile1Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so (adobe-flashplugin)
Profile1PrefSources: prefs.js
Profile1Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile0 (Default) - LastVersion=50.1.0/20161209095719
 Profile1 - LastVersion=47.0/20160606113944 (Out of date)
RelatedPackageVersions:
 google-talkplugin 5.41.3.0-1
 adobe-flashplugin 1:20161213.1-0ubuntu0.16.04.1
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: H1ET85WW(1.23)
dmi.board.asset.tag: Not Available
dmi.board.name: 20208
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrH1ET85WW(1.23):bd04/15/2014:svnLENOVO:pn20208:pvrLenovoB590:rvnLENOVO:rn20208:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20208
dmi.product.version: Lenovo B590
dmi.sys.vendor: LENOVO

[Serhiy (xintx-ua)]

Other errors:

/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Browser;Web;Explorer" for locale string list key "Keywords" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "??????;??????;?????;???;??" for locale string list key "Keywords[ar]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Restolador;Web;Esplorador" for locale string list key "Keywords[ast]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Navegador;Web;Explorador;Explorer" for locale string list key "Keywords[ca]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Prohl??e?;Web;Explorer" for locale string list key "Keywords[cs]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;Internettet;WWW;Browser;Browse;Web;Surf;Nettet" for locale string list key "Keywords[da]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Browser;Web;Explorer;Webseite;Site;surfen;online;browsen" for locale string list key "Keywords[de]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Browser;Web;Explorer;?????????;??????????;Firefox;???????;????????" for locale string list key "Keywords[el]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Explorador;Internet;WWW" for locale string list key "Keywords[es]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Browser;Web;Explorer;selain;Internet-selain;internetselain;verkkoselain;netti;surffaa" for locale string list key "Keywords[fi]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Browser;Web;Explorer;Fureteur;Surfer;Navigateur" for locale string list key "Keywords[fr]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;preglednik;Web" for locale string list key "Keywords[hr]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;B?ng?sz?;Web;H?l?;Net;Explorer" for locale string list key "Keywords[hu]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firefox.desktop: error: value "Internet;WWW;Browser;Web;Navigatore" for locale string list key "Keywords[it]" in group "Desktop Entry" does not have a semicolon (';') as trailing character
/usr/share/applications/firef...