Firefox Stop Reload Buttons in One

Firefox Combine Stop-Reload Buttons:
Combine Stop-Reload Buttons combines the two stop and reload buttons into a single button. When a page is loading, the stop button is used. When the page finishes loading, the reload button is used.

Combine Stop-Reload Buttons 0.4 Website
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Firefox Smart Stop/Reload :
Combines/merges the Stop and Reload toolbar buttons. To avoid unintended reloads, the button is disabled for a split second when a page has finished loading.

Smart Stop/Reload Website
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