I&#x27;m sorry; you&#x27;re right, I misunderstood your needs, and thought that you wanted GIFs not to play at all.  As with &quot;there&#x27;s an app for that&quot;, the answer to most Firefox needs is &quot;there&#x27;s an extension for that&quot;.  I&#x27;m not in touch with the current Firefox extension ecosystem, but some Googling suggests that <a href="https:&#x2F;&#x2F;addons.mozilla.org&#x2F;en-US&#x2F;firefox&#x2F;addon&#x2F;toggle-animated-gifs" rel="nofollow">https:&#x2F;&#x2F;addons.mozilla.org&#x2F;en-US&#x2F;firefox&#x2F;addon&#x2F;toggle-animat...</a> should fill the need.