Please follow the steps below to provide us crash IDs to help us learn more about your crash.

1. Enter about:crashes in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
2. Copy the 5 most recent Report IDs that start with bp- and then go back to your forum question and paste those IDs into the "Post a Reply" box.

Note: If a recent Report ID does not start with bp- click on it to submit the report.

(Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.)

More information and further troubleshooting steps can be found in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

The solution is to

- disable all youtube addons (youtube flashplayer, youtube all htlm5, etc)

- if you're using Flashblock, click on Options, Whitelist, and add *.youtube and *.youtube.* to the Whitelist (also add the youtube url shortcuts *.ytimg.com and *.ytimg.*)

Firefox seems to have temporarily made it universally easier for Youtube to play on all browsers

Also delete

plugin-container.exe and plugin-hang-ui.exe

in your C:\Program Files\Mozilla Firefox, which Firefox 43 and 43's first two updates 43.01 and 43.02 re-install

plugin-container.exe and plugin-hang-ui.exe are notorious for causing firefox crashes, obstructing video play, and excessive memory usage which causes computers to crash