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Thumbnail window in web application needs to be longer

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In WIndows 10, we have a web based application which displays a thumbnail window on the left which is too small and must be scrolled. We would like a longer thumbnail window to enable as many pages as possible to display without scrolling. This is Firefox 49.,0.1 as well as 48.0.

In WIndows 10, we have a web based application which displays a thumbnail window on the left which is too small and must be scrolled. We would like a longer thumbnail window to enable as many pages as possible to display without scrolling. This is Firefox 49.,0.1 as well as 48.0.

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Please see this support article: https://support.mozilla.org/en-US/kb/where-go-developer-support

Specifically - Post a question to the Mozilla Developer Network's Stack Overflow page.