>>8542447right click on the posting forum near the captcha
first of all select the whole page source and hit copy so you have a bunch of junk on your clipboard
anyway find the text area with id "g-recaptcha-response" in the "style" it should have "display: none;" among other things
delete that
now that the box is visible, paste the page source (the garbage) in the box
now hit submit, it will cause an overflow and your post will be given the green light
if you're using 4chanX or other addons that have a client sided checking for the captcha being solved, youll need to just disable those so as to post with the captcha "unsolved"