I think disabling the Add-on "JIRA Activity Stream" is not an option.
We did just that and at the next system restart some important add-ons were not working anymore:
Tempo Timesheet, Structure
Those add-ons seem to have some kind of dependency to some module inside the "JIRA Activity Stream"-Add-on.
So we re-enabled the Add-on but disabled the following modules inside of the Add-on:
Activity Stream Issue Tab Panel (activity-stream-issue-tab)
Activity Stream (activitystream-gadget)
That setup is still working after a server restart.
You can go to JIRA Administration > Add-ons and then disable the "JIRA Activity Stream" plugin on your instance (it is located under System plugins).
Please note that we do not recommend you to disable core plugins, as they can affect the stability of your instance.
-- Arthur Gonçalves
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