I've changed the icons used for Firefox and Thunderbird in the Mate menu, and those work fine. But the icons that appear in the window list and when I do alt+tab are not what I've selected. I assume that replacing a file somewhere will change this, but where and what do I change? Thanks.
New desktop: Linux Mint 17 | Mate 1.8.1 | i5 2500K CPU | 8 GB RAM | GTX 560 Ti | c. 1.6 TB HD ||| Netbook: Xubuntu 10.04 | AMD Dual-core 1.6 GHz | 2 GB RAM | 320 GB HD