Versions

9.0.1	0.80%
8.0.1	0.40%
6.0.2	0.40%
5.0.1	0.40%
5.0	0.40%
21.0	0.40%
21.0	0.40%
21.0	11.20%
20.0.1	3.60%
20.0	2.40%
20.0	0.80%
2.0b7	0.40%
19.0.2	10.80%
19.0.1	0.40%
19.0	8.80%
19.0	0.40%
19.0	0.40%
19.0	0.40%
19.0	0.40%
19.0	0.80%
19.0	0.40%
18.0.2	9.20%
18.0.1	10.80%
18.0	0.40%
18.0	2.80%
18.0	0.40%
18.0	0.40%
17.0.1	18.80%
17.0	0.40%
16.0.2	4.80%
16.0.1	0.80%
16.0	0.40%
16.0	0.40%
15.0.1	0.80%
14.0.1	0.80%
14.0	0.40%
13.0	0.40%
13.0	0.80%
12.0	1.60%
10.0.2	0.40%
10.0.10	0.40%
10.0	0.40%

xpcom.dll has 42 known versions, the most recent one is 9.0.1. The average file size is about 18.99 KB. It is an authenticode code-signed executable issued to Mozilla Corporation by the certification authority Thawte. The programs Mozilla Firefox 18.0.2 (x86 en-US), Mozilla Firefox 18.0.2 (x86 pt-BR) and Mozilla Firefox 16.0.1 (x86 ar) have been observed as installing specific variations of xpcom.dll.

This is a component for Mozilla Firefox, a free and open source web browser developed by the Mozilla Foundation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards. Functions can be added through extensions, created by third-party developers. Firefox uses a sandbox security model, and limits scripts from accessing data from other web sites based on the same origin policy.