Hey Anne Marie,
You can click on the Cog Icon > Add-ons > add-ons and scroll down to the Confluence Update Check to check the compatibility of your add-ons with the version you are targeting to upgrade to.
If your users rely on particular add-ons that are not compatible with the new version, you may want to wait until they are compatible before upgrading Confluence.
However, if they don't rely, you can disable an add-on temporarily while you upgrade and while it is not compatible yet to avoid possible issues.
You can rely on the Confluence 6.1 Upgrade Guide documentation to help you out if you may need any further information.
Hope it helps!
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