When I click on buttons/pull down tabs on a variety of websites , I can see that I have pressed the button but the website does not recognize the action

When I have visited travel websites I can not 'click' on the Calendar. I tried to buy a book and checked off to be visit as a guest - and the website did not recognize the button I had checked off. I tried to edit on 'online profile" and the website does not recognize that I have clicked the 'edit' button.
I have not had problems before and do not understand why this has started to happen.
I am running mac osx 10.7.5 and firefox 21

If this was only on one or two sites, I'd suggest "Option #1" below and it's still a good idea. However, when several sites are involved, I begin to suspect an add-on. Hence, "Option #2" below.
'''Option #1'''
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 Ctrl+Shift+r / Command+Shift+r to reload the page fresh from the server.
Alternately, you also can clear Firefox's cache completely using:
(WIN) orange Firefox button (or Tools menu) > Options > Advanced<br>
(MAC) 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 (complete any pending transaction first). While viewing a page on the site:
* right-click and choose View Page Info > Security > "View Cookies"
* Tools menu > Page Info > Security > "View Cookies"
In the dialog that opens, you can remove the site's cookies individually.
Then try reloading the page. Does that help?
'''Option #2'''
Try the sites in Firefox's Safe Mode. That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: [[Troubleshoot Firefox issues using Safe Mode]].
You can restart Firefox in Safe Mode using
Help > Restart with Add-ons Disabled
In the dialog, click "Start in Safe Mode" (''not'' Reset)
Any difference?

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