Hello,

Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

1. (Firefox 57 and above) Click the Library button and choose History.
   (Click the menu button and choose History in older Firefox versions.)
2. In the History menu, choose "Clear Recent History...".
3. Under "Time range to clear", select "Everything".
4. Now, click the arrow next to Details to toggle the Details list active.
5. From the details list, check Cache and Cookies and uncheck everything else.
6. Now click the "Clear Now" button.

Further information can be found in the Delete browsing, search and download history on Firefox article.

Did this fix your problems? Please report back to us!

Thank you.

I went into Manage Data, chose the Instagram site and deleted all. Comments working perfectly now. FYI, my saved login info was not deleted! Thank you for this simple and easy fix!

OOPS! It only works once. I posted a comment with no problem. But when I tried to post a second comment, I got the unable to post message. I repeated my first steps. It worked again, but only for one time. What now?