I was hacked and they managed to use Soulseek to download all my firefox personal files. How did this happen?

[Tue Aug 13 19:41:09 2013] Adding folder D:/Music/downloading as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/adblockplus as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/bookmarkbackups as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/chatzilla as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/chatzilla/ceip as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/chatzilla/downloads as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/chatzilla/logs as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/chatzilla/scripts as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/chrome as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/battlefieldplay4free@ea.com as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/battlefieldplay4free@ea.com/META-INF as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/battlefieldplay4free@ea.com/plugins as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/foxyproxy@eric.h.jung as part of sharing D:/Music [ [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/foxyproxy@eric.h.jung/modules as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{20a82645-c095-46ed-80e3-08825760534b} as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{20a82645-c095-46ed-80e3-08825760534b}/chrome as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{20a82645-c095-46ed-80e3-08825760534b}/defaults as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{20a82645-c095-46ed-80e3-08825760534b}/defaults/preferences as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d} as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/chrome as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/components as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/defaults as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/defaults/preferences as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/local as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}/chrome as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}/components as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}/defaults as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}/defaults/preferences as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}/META-INF as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/extensions/{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}/modules as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/gm_scripts as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/gm_scripts_08bak as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/dssieq1n.default/minidumps as part of sharing D:/Music [Tue Aug 13 19:41:09 2013] Adding folder D:/Music/echo_plex as part of sharing D:/Music