browser-cachefirefox
I opened a page in Firefox and came back hours later. I reloaded the page (to see if something new was added), but had to notice that something got deleted instead.
Is there a way to see the previous version of the page? Does it get saved in the browser cache? Or will the cached version be removed as soon as I reload the page (and the content changes)?
(If I had expected a deletion, I would have opened the same page in a different tab instead of reloading the page in the same tab.)
You might not be able to store (cache) every page you visited automatically. But you can save any webpage completely (with CSS, images, etc.) into a single HTML file that can be opened in any browser. This is similar to the MHTML feature in chromium browsers (Google Chrome, Opera, etc).
Addons
01: SingleFile | Save a page as a single HTML file by gildas
02: Save Page WE by DW-dev
Sample Screenshot of this webpage using SingleFile addon
Update...
There is a feature in SingleFile Firefox add-on that will let you automatically save every page you visit.
Best Answer
The cached version does not necessarily get removed as soon as you hit refresh. The mere existence of ctrl + f5 to throw out the cached version and request a new copy from server tells that cached version will not be removed as soon as you refreshed the page.
In your case, the cached version from Google or Waybackmachine would not be helpful as they might not even have cached the page in concern. Your best bet may be to inspect your cache with CacheViewer or any similar software to find something useful.
You can access the cached version for any page that has been saved by Google with this: