can't install Firefox browser extension "connection error"

F-secure give this error message when attempting to install on Firefox 58.0.1
"this add-on could not be installed because of a connection error".
How do I fix this problem?
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Hello,
F-Secure, usually, will install extension/add-on automatically.
Did you mean that your experience about manual try to install extension-file to Firefox? And does it Windows platform?
If yes -> does it possible to re-check experience with built-in F-Secure 'reinstallation addon'-functionality.
https://help.f-secure.com/product.html#home/safe-windows/latest/en/task_C9E6D4FA2C7D4A0BA27CD8F1F7037308-safe-windows-latest-en
Or your experience about autoinstallation addon by F-Secure?
Also, otherwise, maybe some Firefox tweaks are needed (for allowing manual installation).
Thanks!
Sorry , I forgot to mention that Firefox is running on Mac OSX "Sierra" 10.12.6
Hello,
So, sorry for my reply. I'm also only F-Secure user (their home solutions). And I'm not really friendly with Mac-platform and F-Secure design on Mac platform.
Based on this Online Documentation:
https://help.f-secure.com/product.html#home/safe-mac/latest/en/task_2D2B7443B9A94482B64630E42949EF68-safe-mac-latest-en
There is button ''Install browser extension''. So, does your experience about such button and next FIrefox's notification?
If yes -> maybe it is possible to re-check such Firefox discussions:
where was different 'sort'-steps. at least, it sounds as global design for Firefox -> and maybe can be useful to re-check with your situation
// I found that noted articles were about 'downloaded' (but not 'installed').
So, maybe if normal F-Secure design does not work. Maybe -> possible to find under your system '.xpi'-file (if it is existed) as F-Secure Browsing Protection addon. And re-try to add it manually to Firefox (like drag'n'drop, for example). Just like another suggestion -> some software/tool will prevent installation addon each time when you tried so.
An option is contact direct F-Secure Support Channels (chat as example):
https://www.f-secure.com/en/web/home_global/contact-support
Sorry for my long reply (and some edititions).
Thanks!