Please check if the browser caching is disabled. Type about:cache in the address bar. If you get a page like below it is clear the cache is disabled.
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To enable the cache, type about:config in the address bar (box 1). The config details are shown. Type cache in the search box to filter only cache related configuration entries (box 2). Ensure that the disk and memory caches are enabled (box 3).
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After enabling the cache, type about:cache in the address bar. You should see a page like this:
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