Firefox "Times Out" so I have to Force Quit & restart (Mac). "clear History etc" doesn't help

Interrupted or reset connection
The following error can occur if the website you're visiting is experiencing problems:
* The connection was interrupted
* The connection was reset
* The connection has timed out
If you can visit the website in other browsers but not in Firefox:
Mac iBook. Recent Firefox upgrade. Now, after various, emphasise various, times (eg 5 min) Firefox jams. It says it's Timed Out. I have to Force Quit, switch off & restart.
How can I make Firefox run continually?
Thanx
Malc9141
This hasn't helped:
3.5/3.6:
1. At the top of the Firefox windowOn the menu bar, click Tools, then select Clear Recent History....
2. In the Time Range to clear: drop-down, select Everything.
3. Click the arrow next to Details to display the list of items that can be cleared.
4. Select both Cookies and Cache.
5. Click Clear Now.

every time I try System Preferences just hangs frozen
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

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    7. Only download anything from sites you know are safe.
    8. Avoid links you receive in email, always be suspicious even if you get something
        you think is from a friend, but you were not expecting.
    9. If there is any question in your mind, then assume it is malware.

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    Thank you for contacting Mozilla Support.

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