PLEASE HELP! Why Firefox teke too long to refresh?

Hello nice members of this forum.
Why Firefox take too long to refresh pages?
PLEASE HELP ME with this problem.
I'm a web designer and this is my problem: after every CSS style change I made I have to wait some time hours to see the change in the front end.
What could be causing this?
Thanks in advance for any help.

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Hold down the Shift key and left-click the Reload button
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (Mac)

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    =======================
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    =======================
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            <CR:CrystalReportSource ID="CrystalReportSource1" runat="server">           
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            </asp:Panel>
        </div>
        </form>
    </body>
    </html>
    =======================
    End - aspx
    =======================

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