the Fission has stopped update. And the Mozilla Develop research group did not think the "progress bar" represent the real website progress. BUT I would like to say, I still love the "progress bar" !!! Thanks you for your efforts ! :)
Progre is a very useful Add-on. It resolves well the fault that the specification of Firefox has. However, the default color of progress bar in Progre is not conspicuous. So, you should modify it to a more conspicuous color. I recommend colors as follows. - The Firefox's fox color: RGB = 237, 135, 18 - Red: RGB = 255, 0, 0 - Green: RGB = 0, 255, 0
"Progre" has a demerit that "Progre" indicates only "from completion of a connection, to completion of all data". Namely, "Progre" cannot indicate "from completion of notification of URL by user, to completion of a connection". On the other hand, "Throbber icon" can indicate "from completion of notification of URL by user, to completion of all data". So, "Throbber icon" is kinder than "Progre". I hope the improvement of the problem.