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I got the impression that I could NOT overdo the cache clearing? When I google 'Firefox, clear cache' i got instructions to chose 'history button', and it gave me the option to 'clear history'.
Automatically I got a list with 7 items listed. Five (5) of those items were already prechecked,..
1) Browsing & Download History
2) Forms & Search History
3) Cookies
4) Cache
5) Active Logins
Then it ask for a time range, and i chose 'Everything'
I assumed this was the normal practice to clear the entire cache ( I truly don't understand the language of these computers these days).
So what has me confused is why I can access some websites that i use to,... yet some of them 'time out' before they can connect??
Cache is only one of the five items, you could have unchecked the rest to only clear the cache. The remaining items have nothing to do with the cache, but do affect browsing.
1) is the history of sites you have visited and the list of files you have downloaded
2) is text you have entered into online forms and your search bar
3) cookies are small files that contain things like site preferences, page last visited, shopping cart data - really almost anything the web service provider cares to store about your visit to their web site on your computer that will fit in 4093 bytes.
4) is the cache were websites store files (web pages, images) locally on your computer. If no changes have been made on the website the browser can use the local cached copy instead of downloading it again, speeds up browsing by not having to download everything again. This can cause problems as you experienced when the browser doesn't know the cached copy of a file (your avatar in this case) is not out of date and uses the local file instead of downloading that file from the website you are viewing.
5) Active Logins are for sites that remember you are logged in when on a login page and you click the option to stay logged in. This will not erase passwords, but will require you login again when you visit a site where you were previously logged in.
If you can test accessing the websites with Internet Explorer that would be useful as well to prove it is a problem with firefox or your internet access.
Because of the strangeness you are experiencing I would power cycle (reboot) your router and/or modem as Bill suggests. First make sure no one is using the internet, streaming videos (watching netflix) so you don't upset them as you loose all internet connectivity when you reboot the router and modem. Also without knowing what kind of internet service you have makes it hard to say if you have one or two boxes or more to power cycle.
So as Joe suggests trying to find someone local to you who is computer/internet savvy would be best.
When you power cycle the box(es) leave them off for 30 seconds to a minute for your Internet Service Provider to realize you have dropped off the network to give you new good information. Depending on whether you have one box router/modem combined or two separate boxes will depend on how you reboot those. You do not have to do anything with your TV set top boxes they are separate from the router/modem boxes. If you have two, a cable modem and a separate router/wireless access point, turn them both off then turn on the modem first and give it a minute to boot, then turn on the router and give it time to boot before you try to access a website.
If this doesn't help you may have to call your internet provider for help.
If you want more help here I really feel it would be useful to know what version of windows you are using and what version of firefox you have.