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+# pseudo-code for proxy selection
+
+## Suppose we have 6 proxy definitions + Default:
+
+### Proxy foo1
+  a. http proxy on 123.123.123.123:8080
+	b. username/password auth
+  b. whitelist pattern "*.google.com"
+	c. blacklist pattern "foo.google.com"
+
+### Proxy foo2
+  a. socks proxy on 999.999.99.999:1080
+	b. username/password auth
+	c. whitelist pattern "*.facebook.com"
+
+### Proxy foo3
+  a. PAC at https://192.168.1.1/proxy.pac
+	b. no username/password auth
+	c. whitelist pattern "*.internalstuffs.zzz"   (intranet address)
+
+### Proxy foo4
+  a. PAC at https://192.168.1.2/proxy.pac
+  b no username/password auth
+  c. whitelist pattern "*.internalstuffs.yyy"   (intranet address)
+
+### Proxy foo5
+  a. System settings
+  b. no username/password auth (no applicable for system settings anyway)
+  c. whitelist pattern "*.bar.com"
+
+### Proxy foo6
+  a. WPAD (auto-detect, not supported by Firefox proxyAPI right now)
+	b. no username/password auth (no applicable for system settings anyway)
+  c. whitelist pattern "*.bar.com"
+
+### Default
+  a. Set to DIRECT (no proxy)
+	b. no username/password auth
+	c. no patterns -- not supported by FoxyProxy
+
+## User sets mode to "patterns"
+
+
+### Suppose URL about to be loaded by browser is https://www.google.com/
+
+http proxy on 123.123.123.123:8080 is used to load the URL
+
+```const proxySettings = {
+  proxyType: "manual",
+  http: "http://123.123.123.123:8080",
+  httpProxyAll: true,
+	autoLogin: true
+};
+proxy.settings.set(proxySettings)```
+
+### Suppose URL about to be loaded by browser is https://foo.google.com/
+
+This matches the blacklist pattern in proxy `foo1`. Blacklist patterns take precedence
+over whitelist patterns. So `foo1` is not used to load this URL. The other proxy patterns
+are checked. None match, so `Default` is used.
+
+```const proxySettings = {
+  proxyType: "none",
+	autoLogin: true,
+	httpProxyAll: true // I don't know if this is necessary but cannot hurt
+};
+proxy.settings.set(proxySettings)```
+
+### Suppose URL about to be loaded by browser is https://www.facebook.com/index.html
+
+socks proxy on 999.999.99.999:1080 is used to load the URL
+
+### Suppose URL about to be loaded by browser is https://internalstuffs.zzz/payroll/my-paycheck.pdf
+
+https://192.168.1.1/proxy.pac is used to load the URL. FoxyProxy doesn't know what this PAC
+is doing. Maybe it has its own URL pattern matching, maybe not. Does not matter.
+
+```const proxySettings = {
+  autoConfigUrl: pacUrl that user specified
+	autoLogin: true,
+	httpProxyAll: true // I don't know if this is necessary but cannot hurt
+};
+proxy.settings.set(proxySettings)```
+