# AMO Bug - When addon is installed, the button still says '+ Add to Firefox'

**URL:** <https://discourse.mozilla.org/t/amo-bug-when-addon-is-installed-the-button-still-says-add-to-firefox/5963>\
**Category:** addons.mozilla.org\
**Created:** [December 15, 2015, 12:23pm UTC](https://discourse.mozilla.org/t/amo-bug-when-addon-is-installed-the-button-still-says-add-to-firefox/5963 "2015-12-15T12:23:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![someone23](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@someone23](https://discourse.mozilla.org/u/someone23)\
**Post date:** [December 15, 2015, 12:23pm UTC](https://discourse.mozilla.org/t/amo-bug-when-addon-is-installed-the-button-still-says-add-to-firefox/5963/1 "2015-12-15T12:23:39Z")

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I don’t know if this is intended or a bug, but if you have installed an addon, then visit that page on AMO, the button still says **+ Add to Firefox**.

Should it not say something else like **Update Now**? Or check and say **Update Now** if your version is out-of-date, then hide the button if the addon is up-to-date?

Also while the page is loading, the button is temporarily blue, and says **Download Now** , nut it changes to normal after the page has finished loading.

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**Author:** ![TheOne](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/theone/32/49872_2.png) [@TheOne](https://discourse.mozilla.org/u/TheOne)\
**Post date:** [December 15, 2015, 12:52pm UTC](https://discourse.mozilla.org/t/amo-bug-when-addon-is-installed-the-button-still-says-add-to-firefox/5963/2 "2015-12-15T12:52:30Z")

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AMO cannot know whether an extension is installed or not. I don’t think it’s a good idea to expose the list of installed add-ons to websites. We could do it for AMO only, but extensions could easily extend that feature and send a list of installed extensions to another server.