It's not letting me compose a letter

It will not allow me to go back to the inbox and will not allow me to compose a letter

Hi mickbenzo, are you having this problem on a webmail site, such as Gmail, Yahoo! mail, Hotmail/Outlook, or another one? Because suggestions might be related to that detail, can you provide more information about the problem?
Here is some general advice that might be useful:
When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.
(1) Bypass Firefox's Cache
Use Command+Shift+r to reload the page fresh from the server.
Alternately, you also can clear Firefox's cache completely using:
Firefox menu > Preferences > Advanced
On the Network mini-tab > Cached Web Content : "Clear Now"
If you have a large hard drive, this might take a few minutes.
(2) Remove the site's cookies (save any pending work first). While viewing a page on the site:
Tools menu > Page Info > Security > "View Cookies"
That will open a dialog where you can remove the site's cookies individually.
Then try reloading the page and log in again. Does it work any better?

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