Turn off caching in Firefox

1. Enter in the address bar: about:config Enter
in the filter: network.http.use-cache
Explanation: When a page is loaded, it can be cached so it doesn't need to be downloaded to be redisplayed. This preference controls whether to cache files retrieved by HTTP or HTTPS either in memory or on disk.
Set to: false

2. Enter: about:config in the address bar
and enter in the filter: browser.cache.disk.enable
Explanation: When a page is loaded, it can be cached so it doesn't need to be downloaded to be redisplayed. For e-mail and news, messages and attachments are cached as well. This preference controls whether to use the hard drive for caching purposes. browser. cache.disk.capacity controls the maximum amount of disk space to use.
Set to false

3, and another property: browser.cache.memory.enable
network.http.use-cache means setting not to cache.
browser.cache.disk.enable/browser.cache.memory.enable refers to whether the setting is saved in disk or memory after the above property is turned on (true).

Just network.http.use-cache is the premise.

I turned all three off (set to false) and it finally worked.