Anthy doesn't work properly after using google translate

I expected that switching from google translate on firefox or chrome to a text editor, anthy would continue to underline words and convert roman text to hiragana and kanji

instead... after using google translate, the anthy icon still shows in the panel, but text is not underlined or converted to japanese. (although the bug is a bit intermittent and happens about 50% of the time, so try it two or three times to see what I mean)

Open a text application, e.g. Writer or Anki or Pluma Text Editor or Skype.
press Ctrl Space. Anthy is now on and shows in the panel (on mint)
Type something and hit space.

NOw switch to firefox or chrome and open translate.google.com
type some　gobbledy-gook (e.g ldgk) and hit space.
Now switch back to the text editor.
Anthy symbol still shows in the panel　but typing is in english.
Switch back to the browser and its in Japanese again.

Description: Linux Mint 17.3 Rosa (but its the same on trusty-tahr)
anthy:
  Installed: 9100h-23ubuntu2
  Candidate: 9100h-23ubuntu2
  Version table:
 *** 9100h-23ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: anthy 9100h-23ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-32.37~14.04.1-generic 3.19.8-ckt7
Uname: Linux 3.19.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: MATE
Date: Fri Feb 19 17:23:27 2016
InstallationDate: Installed on 2016-02-19 (0 days ago)
InstallationMedia: Linux Mint 17.3 "Rosa" - Release amd64 20151128
SourcePackage: anthy
UpgradeStatus: No upgrade log present (probably fresh install)