Interestingly, just this week for the first time ever I disabled my flash plugin in Firefox 36 (I think) on Ubuntu 14.04. The only use I've had for it was videos anyway, mostly youtube. However, I promptly found cases where my personal UX with the HTML5 video player on youtube was worse than with flash: in one occasion, I couldn't jump to a specific point in time by clicking on the red progress bar just above the player controls; and another time, clicking on video annotations that contained a hyperlink didn't work.

So I ended up turning Flash back on.

Is this something particular to my setup, or have others had similar experiences?