Adding back Flash/NPAPI support

[K4sum1]

I was requested to do this, however this is a big task, would add a bunch of complexity, and deviates quite a bit from the main idea of being a Windows 7 compatible browser. However if someone is willing to pr flash support back in, and maintain it, maybe only for ESR, then I would be willing to merge it.

All related commits that I can find from bugzilla:
https://hg.mozilla.org/mozilla-central/rev/9036b58142b50ecf80a42c6e8968a387a84c51cd
https://hg.mozilla.org/mozilla-central/rev/c0ff7dbb807e2c2e57fbcdae68b8b70942886b04
https://hg.mozilla.org/mozilla-central/rev/847bd43fd835e0ef3eb3b25aacf0d0ebf2b97b67
https://hg.mozilla.org/mozilla-central/rev/ebcfcf919663
https://hg.mozilla.org/mozilla-central/rev/1c07317c6dbf
https://hg.mozilla.org/mozilla-central/rev/080aa7b074c3
https://hg.mozilla.org/mozilla-central/rev/3739f10fd744
https://hg.mozilla.org/mozilla-central/rev/8f1aa45d854b
https://hg.mozilla.org/mozilla-central/rev/11170fb7e7fe
https://hg.mozilla.org/mozilla-central/rev/4dba093cbb34
https://hg.mozilla.org/mozilla-central/rev/29ce5e7ceaa6
https://hg.mozilla.org/mozilla-central/rev/a5d8b38876d8
https://hg.mozilla.org/mozilla-central/rev/d789ce825491
https://hg.mozilla.org/mozilla-central/rev/32a2fdad82bb
https://hg.mozilla.org/mozilla-central/rev/6e00aba7e14f
https://hg.mozilla.org/mozilla-central/rev/ee8836383bf0
https://hg.mozilla.org/mozilla-central/rev/2e011ce4adbf
https://hg.mozilla.org/mozilla-central/rev/4639cb0ba184
https://hg.mozilla.org/mozilla-central/rev/c76b18432fa2
https://hg.mozilla.org/mozilla-central/rev/ac573562d3df
https://hg.mozilla.org/mozilla-central/rev/f2ad1724e9af
https://hg.mozilla.org/mozilla-central/rev/ee8b4ffc4aca
https://hg.mozilla.org/mozilla-central/rev/6999a4083233
https://hg.mozilla.org/mozilla-central/rev/a0b2f4d23544
https://hg.mozilla.org/mozilla-central/rev/2155fb99d845
https://hg.mozilla.org/mozilla-central/rev/36306d2ee01f
https://hg.mozilla.org/mozilla-central/rev/654058730d71
https://hg.mozilla.org/mozilla-central/rev/196e52cf4488
https://hg.mozilla.org/mozilla-central/rev/5b8bfc8a569a
https://hg.mozilla.org/mozilla-central/rev/aaf121bd46d1
https://hg.mozilla.org/mozilla-central/rev/81361995e7ed
https://hg.mozilla.org/mozilla-central/rev/b9d74690e7f1
https://hg.mozilla.org/mozilla-central/rev/ebde9f72db43
https://hg.mozilla.org/mozilla-central/rev/9e6b2af2a4c9
https://hg.mozilla.org/mozilla-central/rev/46ff02acf7be
https://hg.mozilla.org/mozilla-central/rev/87c164e0c093
https://hg.mozilla.org/mozilla-central/rev/bdcbb8d22b91
https://hg.mozilla.org/mozilla-central/rev/e39ed1138976
https://hg.mozilla.org/mozilla-central/rev/0c47e25d063f
https://hg.mozilla.org/mozilla-central/rev/78c4b82a3015
https://hg.mozilla.org/mozilla-central/rev/8f2595f0dfda
https://hg.mozilla.org/mozilla-central/rev/172084df9b2b
https://hg.mozilla.org/mozilla-central/rev/72421ad7ff7b
https://hg.mozilla.org/mozilla-central/rev/2c9db4cd3d89
https://hg.mozilla.org/mozilla-central/rev/d3ddd7384de2
https://hg.mozilla.org/mozilla-central/rev/af42b96cd2b8
https://hg.mozilla.org/mozilla-central/rev/4b6c96d212f4
https://hg.mozilla.org/mozilla-central/rev/6ec93ada1e62
https://hg.mozilla.org/mozilla-central/rev/bc1cc01f5898
https://hg.mozilla.org/mozilla-central/rev/a43143cd7a24
https://hg.mozilla.org/mozilla-central/rev/64e6fc7cfaeb
https://hg.mozilla.org/mozilla-central/rev/3f1967bdcd23
https://hg.mozilla.org/mozilla-central/rev/5ca239d1722f
https://hg.mozilla.org/mozilla-central/rev/00755ad9503e
https://hg.mozilla.org/mozilla-central/rev/9a2b5d6683a0
https://hg.mozilla.org/mozilla-central/rev/99d3a8e44368
https://hg.mozilla.org/mozilla-central/rev/1ae388d5e3d3
https://hg.mozilla.org/mozilla-central/rev/4edb5320e3fe
https://hg.mozilla.org/mozilla-central/rev/2ecfe9d9e074
https://hg.mozilla.org/mozilla-central/rev/1fc719dc7f9f
https://hg.mozilla.org/mozilla-central/rev/281695ebfa30
https://hg.mozilla.org/mozilla-central/rev/b7c00efa0444
https://hg.mozilla.org/mozilla-central/rev/dd546e629214
https://hg.mozilla.org/mozilla-central/rev/c07b32cdfb47
https://hg.mozilla.org/mozilla-central/rev/3c894371eace

mozilla@6b176f5

[jasonliul]

Second your motion.

[greyrat116]

NPAPI plugins in Youtube https://www.youtube.com/watch?v=b-6MczEoa6I