As to your own devices, you can use Firefox sync.

https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer Sync your bookmarks, history, passwords, add-ons and open tabs with another copy of Firefox. Learn how to set up Sync.

https://support.mozilla.org/en-US/kb/how-do-i-choose-what-types-information-sync-firefox We'll show you how to choose which types of information (bookmarks, history, add-ons, and passwords) to share across all your devices through Firefox Sync.

https://support.mozilla.org/en-US/kb/firefox-sync-troubleshooting-and-tips

https://support.mozilla.org/en-US/kb/sync-firefox-bookmarks-and-browsing-history-iOS Sync your passwords, history, tabs and other browsing information across your iOS, Android and desktop computers with Firefox Accounts.

As for others, you can send them the links to the add-ons.

Hi,

I'm afraid I can't use the firefox account since other users will be using my computer. It is possible to sync/save my the addons automatically when user logged in in my pc without using firefox sync?

Thanks,

Each user account on the computer will have its own Firefox profile. Thus, each can have its own sync account (using their own e-mail).

You can use sync to share the add-ons as long as you don't sync anything else. However, a profile can have access to only one sync account at a time.

FredMcD said

As for others, you can send them the links to the add-ons.