Bug#859100: webkit2gtk: webkit2gtk loads system-installed extensions by default

[Jérémy Lal]

Package: libwebkit2gtk-4.0-37
Version: 2.14.5-2
Severity: normal
File: webkit2gtk

It appears that when/if a java or flash plugin is installed from
another debian package, webkit2gtk tries to load it, even when
setting a custom, local, webextensions directory as documented in
https://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebContext.html#webkit-web-context-set-web-extensions-directory

This is really a cause of many troubles, for example, i had installed
browser-plugin-freshplayer-pepperflash
and some webkitgtk client i use suddenly started crashing - but this
auto-loading behavior does not seem to be documented.

Jérémy


-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (1001, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libwebkit2gtk-4.0-37:amd64 depends on:
ii  libatk1.0-0                             2.22.0-1
ii  libc6                                   2.24-9
ii  libcairo2                               1.14.8-1
ii  libegl1-mesa [libegl1-x11]              13.0.5-1
ii  libenchant1c2a                          1.6.0-11+b1
ii  libfontconfig1                          2.11.0-6.7+b1
ii  libfreetype6                            2.6.3-3+b2
ii  libgcc1                                 1:6.3.0-10
ii  libgdk-pixbuf2.0-0                      2.36.5-2
ii  libgl1-mesa-glx [libgl1]                13.0.5-1
ii  libglib2.0-0                            2.50.3-1
ii  libgnutls30                             3.5.8-3
ii  libgstreamer-plugins-base1.0-0          1.10.4-1
ii  libgstreamer1.0-0                       1.10.4-1
ii  libgtk-3-0                              3.22.9-4
ii  libharfbuzz-icu0                        1.4.2-1
ii  libharfbuzz0b                           1.4.2-1
ii  libhyphen0                              2.8.8-5
ii  libicu57                                57.1-5
ii  libjavascriptcoregtk-4.0-18             2.14.5-2
ii  libjpeg62-turbo                         1:1.5.1-2
ii  libnotify4                              0.7.7-1+b1
ii  libpango-1.0-0                          1.40.4-1
ii  libpng16-16                             1.6.28-1
ii  libsecret-1-0                           0.18.5-3.1
ii  libsoup2.4-1                            2.56.0-2
ii  libsqlite3-0                            3.16.2-3
ii  libstdc++6                              6.3.0-10
ii  libwayland-client0                      1.12.0-1
ii  libwayland-egl1-mesa [libwayland-egl1]  13.0.5-1
ii  libwayland-server0                      1.12.0-1
ii  libwebp6                                0.5.2-1
ii  libx11-6                                2:1.6.4-3
ii  libxcomposite1                          1:0.4.4-2
ii  libxdamage1                             1:1.1.4-2+b3
ii  libxml2                                 2.9.4+dfsg1-2.2
ii  libxslt1.1                              1.1.29-2
ii  zlib1g                                  1:1.2.8.dfsg-5

Versions of packages libwebkit2gtk-4.0-37:amd64 recommends:
ii  gstreamer1.0-plugins-base  1.10.4-1
ii  gstreamer1.0-plugins-good  1.10.4-1
pn  libwebkit2gtk-4.0-37-gtk2  <none>

libwebkit2gtk-4.0-37:amd64 suggests no packages.

-- no debconf information