In order to make for display cached pages after cold start when you're offline:

Go to about:config
Set browser.tabs.useCache to true

I filed a bug that they make this the default:

Because, why not? The feature was enabled then subsequently disabled in 2016. And for years I had to wait for getting off metro to read stuff in my tabs because Android decided to kill Firefox at some random point in time and Firefox would rather show Server Not Found page.

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