Como eu redimensionar e bloquear as janelas do navegador Firefox para tamanhos específicos?
Por exemplo, minha resolução é mais alta, mas quero corrigir a largura para 768px e bloqueá-la.
Firesizer permite que você redimensione a janela para dimensões específicas.
Firesizer provides a menu and status bar to resize the window dimensions to a specific size. Unlike other similar extensions, this one sets the size of the entire window, not just the HTML area, which better reflects the environment that end users will be using.
Eu usei o Sizer para Windows: link
Do site:
Sizer is a freeware utility that allows you to resize any window to an exact, predefined size. This is extremely useful when designing web pages, as it allows you to see how the page will look when viewed at a smaller size. The utility is also handy when compiling screen-shots for documentation, using Sizer allows you to easily maintain the same window size across screen grabs.