Firefox locks with "script stopped working" dialog box

[LordYanaek]

Firefox 51.0.1 on Windows 10

Hello. i've read about this addon and liked the idea so i decided to install it. Unfortunately after restarting Firefox "locked" with a "script stopped working" dialog box. Clicking "wait for script to respond" brings the same dialog every 15sec or so. Clicking "stop script" results in firefox "half freezing" : the opened tab is working, i can click links, but the UI doesn't work (i can't switch tabs, menu entries does nothing and i must right click on the taskbar to quit). Strangely clicking "debug script" and then closing the debug panel actually returns firefox to almost normal behavior but my LastPass add-on doesn't work (i don't know if other add-ons are affected).
I disabled priv8 and everything is working again.

Here is my list of add-ons in case there is a conflict (taken from about:support page)

Nom                                 Version                 Activée  ID
Add to Search Bar                   2.9                     true     add-to-searchbox@maltekraus.de
Application Update Service Helper   1.0                     true     aushelper@mozilla.org
cliget                              1.2.3.1-signed.1-signed true     cliget@zaidabdulla.com
Colour That Site!                   0.17                    true     ColourThatSite@einspeiser.de
Configuration Mania                 25.1.0                  true     {c4d362ec-1cff-4ca0-9031-99a8fad7995a}
DownThemAll!                        3.0.8                   true     {DDC359D1-844A-42a7-9AA1-88A850A938A8}
DownThemAll! AntiContainer          1.5                     true     anticontainer@downthemall.net
eID Belgique                        1.0.22                  true     belgiumeid@eid.belgium.be
FEBE                                8.9.3.1                 true     {4BBDD651-70CF-4821-84F8-2B918CF89CA3}
FlashGot                            1.5.6.14                true     {19503e42-ca3c-4c27-b1e2-9cdb2170ee34}
Image Picker                        1.9.5                   true     ImagePicker@topolog.org
Insite Search                       1.0.6.1-signed.1-signed true     onsitesearch@netload.biz
LastPass                            3.3.2                   true     support@lastpass.com
Multi-process staged rollout        1.7                     true     e10srollout@mozilla.org
New Tab Tools                       77                      true     newtabtools@darktrojan.net
NoScript                            2.9.5.3                 true     {73a6fe31-595d-460b-a920-fcc0f8843232}
Pocket                              1.0.5                   true     firefox@getpocket.com
Print Edit                          17.7                    true     printedit@DW-dev
RightToClick                        2.9.6                   true     {cd617375-6743-4ee8-bac4-fbf10f35729e}
Save Images                         1.1.0.3                 true     LDSI_plashcor@gmail.com
ScrapBook X                         1.13.8                  true     scrapbookx@addons.mozilla.org
Snap Links                          3.1.1.3                 true     snaplinks@snaplinks.mozdev.org
TableTools2                         1.17.1-signed.1-signed  true     tabletools2@mingyi.org
Theme Font & Size Changer           51.0                    true     {f69e22c7-bc50-414a-9269-0f5c344cd94c}
Web Compat                          1.0                     true     webcompat@mozilla.org
Logitech SetPoint                   6.5                     false    {F003DA68-8256-4b37-A6C4-350FA04494DF}
Priv8                               0.2.0                   false    id@baku.priv8
WOT                                 20151208                false    {a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7}

Logitech SetPoint and WoT have been disabled for quite some time.

If you want more information, let me know. I don't have a crash report as there were no real crash.