Got exactly the same problem as described by starlight on Firefox 52.5.3 esr (also 52.5.2 esr) - no icons nowhere (also not in "settings" - neither “available services” nor “my services”), was not lucky enough to get the previous version (STARLIGHT, IF YOU READ IT, COULD YOU PLEASE MAKE THE VERSION 16.7.0 AVAILABLE? SAME REQUEST TO THE AUTHORS OF THE ADDON), but only got an .xpi file of a version 188.8.131.52.1 and am glad at least to have a working addon, but it's tricky to get the actual addresses of the services therein (just for example - there isn't even Google Drive link and the added button with it's address https://www.drive.google.com and Name 'GDrive' remains 'Custom Button 1' and shows errors etc.).
Do not want to give just one star etc., as i used this addon for years and was - and am - glad that it exists and do not want to ruin it, but it's impossible to write smth here without giving some amount of stars, so just took one star away from the 5, thinking, that if there were all 5, no one sees that I'm describing an issue.... A kind of a dilemma ;)
v.16.7.0 worked fine for me on FF52 ESR. However, v.16.8.0 completely broke, with no icons in either “available services” or “my services”. So I thought I’d re-install 16.7.0 - except ALL previous, older, versions have been deleted from the Version History page!!! Other add-ons still maintain a history of downloadable previous add-ons, so why has Google Shortcuts deleted theirs?
I managed to get back to v.16.7.0 by restoring my FF profile from a Time Machine backup on my Mac. But I shouldn’t have had to, had previous versions still been there on AMO.
I can’t give more than 1 star for something that doesn’t work at all...
This version surrendered the great functionality of earlier versions, which permitted tailoring your shortcuts so that you could add, for example, the NY Times in to the panel of shortcuts. I used the older version constantly; this version feels more like an ad for Google products and is far less useful.
Potentially the great extension, but still not adapted for Quantum. Currently not works (v16.6.1): 1) Custom shortcuts (if you add an one shortcut the extension will show empty popup) 2) Manual removing shortcuts from "My services" 3) Option "Reset settings to default"
Stopped working with the new update (20 Nov 2017). It looks nice in one button, but icons do nothing. Firefox 52.5.0 (32-bit) with Windows XP. UPDATE: Now it works after new update (20 Nov 2017). Wow, you work FAST.
And yet another extension broken by the WebExtension update. Even though the settings import doesn't work any more from previous versions, I managed to configure the icons (though it was a bit buggy), but now when I try to click on them in the app's popup window, nothing happens. Rolling back to the previous version for now. Firefox ESR 52.5.0.