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diff --git a/ext/bg/js/conditions-ui.js b/ext/bg/js/conditions-ui.js
new file mode 100644
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+++ b/ext/bg/js/conditions-ui.js
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+/*
+ * Copyright (C) 2019  Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+class ConditionsUI {
+    static instantiateTemplate(templateSelector) {
+        const template = document.querySelector(templateSelector);
+        const content = document.importNode(template.content, true);
+        return $(content.firstChild);
+    }
+}
+
+ConditionsUI.Container = class Container {
+    constructor(conditionDescriptors, conditionNameDefault, conditionGroups, container, addButton) {
+        this.children = [];
+        this.conditionDescriptors = conditionDescriptors;
+        this.conditionNameDefault = conditionNameDefault;
+        this.conditionGroups = conditionGroups;
+        this.container = container;
+        this.addButton = addButton;
+
+        this.container.empty();
+
+        for (const conditionGroup of conditionGroups) {
+            this.children.push(new ConditionsUI.ConditionGroup(this, conditionGroup));
+        }
+
+        this.addButton.on('click', () => this.onAddConditionGroup());
+    }
+
+    cleanup() {
+        for (const child of this.children) {
+            child.cleanup();
+        }
+
+        this.addButton.off('click');
+        this.container.empty();
+    }
+
+    save() {
+        // Override
+    }
+
+    isolate(object) {
+        // Override
+        return object;
+    }
+
+    remove(child) {
+        const index = this.children.indexOf(child);
+        if (index < 0) {
+            return;
+        }
+
+        child.cleanup();
+        this.children.splice(index, 1);
+        this.conditionGroups.splice(index, 1);
+    }
+
+    onAddConditionGroup() {
+        const conditionGroup = this.isolate({
+            conditions: [this.createDefaultCondition(this.conditionNameDefault)]
+        });
+        this.conditionGroups.push(conditionGroup);
+        this.save();
+        this.children.push(new ConditionsUI.ConditionGroup(this, conditionGroup));
+    }
+
+    createDefaultCondition(type) {
+        let operator = '';
+        let value = '';
+        if (this.conditionDescriptors.hasOwnProperty(type)) {
+            const conditionDescriptor = this.conditionDescriptors[type];
+            operator = conditionDescriptor.defaultOperator;
+            ({value} = this.getOperatorDefaultValue(type, operator));
+            if (typeof value === 'undefined') {
+                value = '';
+            }
+        }
+        return {type, operator, value};
+    }
+
+    getOperatorDefaultValue(type, operator) {
+        if (this.conditionDescriptors.hasOwnProperty(type)) {
+            const conditionDescriptor = this.conditionDescriptors[type];
+            if (conditionDescriptor.operators.hasOwnProperty(operator)) {
+                const operatorDescriptor = conditionDescriptor.operators[operator];
+                if (operatorDescriptor.hasOwnProperty('defaultValue')) {
+                    return {value: operatorDescriptor.defaultValue, fromOperator: true};
+                }
+            }
+            if (conditionDescriptor.hasOwnProperty('defaultValue')) {
+                return {value: conditionDescriptor.defaultValue, fromOperator: false};
+            }
+        }
+        return {fromOperator: false};
+    }
+};
+
+ConditionsUI.ConditionGroup = class ConditionGroup {
+    constructor(parent, conditionGroup) {
+        this.parent = parent;
+        this.children = [];
+        this.conditionGroup = conditionGroup;
+        this.container = $('<div>').addClass('condition-group').appendTo(parent.container);
+        this.options = ConditionsUI.instantiateTemplate('#condition-group-options-template').appendTo(parent.container);
+        this.separator = ConditionsUI.instantiateTemplate('#condition-group-separator-template').appendTo(parent.container);
+        this.addButton = this.options.find('.condition-add');
+
+        for (const condition of conditionGroup.conditions) {
+            this.children.push(new ConditionsUI.Condition(this, condition));
+        }
+
+        this.addButton.on('click', () => this.onAddCondition());
+    }
+
+    cleanup() {
+        for (const child of this.children) {
+            child.cleanup();
+        }
+
+        this.addButton.off('click');
+        this.container.remove();
+        this.options.remove();
+        this.separator.remove();
+    }
+
+    save() {
+        this.parent.save();
+    }
+
+    isolate(object) {
+        return this.parent.isolate(object);
+    }
+
+    remove(child) {
+        const index = this.children.indexOf(child);
+        if (index < 0) {
+            return;
+        }
+
+        child.cleanup();
+        this.children.splice(index, 1);
+        this.conditionGroup.conditions.splice(index, 1);
+
+        if (this.children.length === 0) {
+            this.parent.remove(this, false);
+        }
+    }
+
+    onAddCondition() {
+        const condition = this.isolate(this.parent.createDefaultCondition(this.parent.conditionNameDefault));
+        this.conditionGroup.conditions.push(condition);
+        this.children.push(new ConditionsUI.Condition(this, condition));
+    }
+};
+
+ConditionsUI.Condition = class Condition {
+    constructor(parent, condition) {
+        this.parent = parent;
+        this.condition = condition;
+        this.container = ConditionsUI.instantiateTemplate('#condition-template').appendTo(parent.container);
+        this.input = this.container.find('input');
+        this.typeSelect = this.container.find('.condition-type');
+        this.operatorSelect = this.container.find('.condition-operator');
+        this.removeButton = this.container.find('.condition-remove');
+
+        this.updateTypes();
+        this.updateOperators();
+        this.updateInput();
+
+        this.input.on('change', () => this.onInputChanged());
+        this.typeSelect.on('change', () => this.onConditionTypeChanged());
+        this.operatorSelect.on('change', () => this.onConditionOperatorChanged());
+        this.removeButton.on('click', () => this.onRemoveClicked());
+    }
+
+    cleanup() {
+        this.input.off('change');
+        this.typeSelect.off('change');
+        this.operatorSelect.off('change');
+        this.removeButton.off('click');
+        this.container.remove();
+    }
+
+    save() {
+        this.parent.save();
+    }
+
+    updateTypes() {
+        const conditionDescriptors = this.parent.parent.conditionDescriptors;
+        const optionGroup = this.typeSelect.find('optgroup');
+        optionGroup.empty();
+        for (const type of Object.keys(conditionDescriptors)) {
+            const conditionDescriptor = conditionDescriptors[type];
+            $('<option>').val(type).text(conditionDescriptor.name).appendTo(optionGroup);
+        }
+        this.typeSelect.val(this.condition.type);
+    }
+
+    updateOperators() {
+        const conditionDescriptors = this.parent.parent.conditionDescriptors;
+        const optionGroup = this.operatorSelect.find('optgroup');
+        optionGroup.empty();
+
+        const type = this.condition.type;
+        if (conditionDescriptors.hasOwnProperty(type)) {
+            const conditionDescriptor = conditionDescriptors[type];
+            const operators = conditionDescriptor.operators;
+            for (const operatorName of Object.keys(operators)) {
+                const operatorDescriptor = operators[operatorName];
+                $('<option>').val(operatorName).text(operatorDescriptor.name).appendTo(optionGroup);
+            }
+        }
+
+        this.operatorSelect.val(this.condition.operator);
+    }
+
+    updateInput() {
+        const conditionDescriptors = this.parent.parent.conditionDescriptors;
+        const {type, operator} = this.condition;
+        const props = {
+            placeholder: '',
+            type: 'text'
+        };
+
+        const objects = [];
+        if (conditionDescriptors.hasOwnProperty(type)) {
+            const conditionDescriptor = conditionDescriptors[type];
+            objects.push(conditionDescriptor);
+            if (conditionDescriptor.operators.hasOwnProperty(operator)) {
+                const operatorDescriptor = conditionDescriptor.operators[operator];
+                objects.push(operatorDescriptor);
+            }
+        }
+
+        for (const object of objects) {
+            if (object.hasOwnProperty('placeholder')) {
+                props.placeholder = object.placeholder;
+            }
+            if (object.type === 'number') {
+                props.type = 'number';
+                for (const prop of ['step', 'min', 'max']) {
+                    if (object.hasOwnProperty(prop)) {
+                        props[prop] = object[prop];
+                    }
+                }
+            }
+        }
+
+        for (const prop in props) {
+            this.input.prop(prop, props[prop]);
+        }
+
+        const {valid} = this.validateValue(this.condition.value);
+        this.input.toggleClass('is-invalid', !valid);
+        this.input.val(this.condition.value);
+    }
+
+    validateValue(value) {
+        const conditionDescriptors = this.parent.parent.conditionDescriptors;
+        let valid = true;
+        try {
+            value = conditionsNormalizeOptionValue(
+                conditionDescriptors,
+                this.condition.type,
+                this.condition.operator,
+                value
+            );
+        } catch (e) {
+            valid = false;
+        }
+        return {valid, value};
+    }
+
+    onInputChanged() {
+        const {valid, value} = this.validateValue(this.input.val());
+        this.input.toggleClass('is-invalid', !valid);
+        this.input.val(value);
+        this.condition.value = value;
+        this.save();
+    }
+
+    onConditionTypeChanged() {
+        const type = this.typeSelect.val();
+        const {operator, value} = this.parent.parent.createDefaultCondition(type);
+        this.condition.type = type;
+        this.condition.operator = operator;
+        this.condition.value = value;
+        this.save();
+        this.updateOperators();
+        this.updateInput();
+    }
+
+    onConditionOperatorChanged() {
+        const type = this.condition.type;
+        const operator = this.operatorSelect.val();
+        const {value, fromOperator} = this.parent.parent.getOperatorDefaultValue(type, operator);
+        this.condition.operator = operator;
+        if (fromOperator) {
+            this.condition.value = value;
+        }
+        this.save();
+        this.updateInput();
+    }
+
+    onRemoveClicked() {
+        this.parent.remove(this);
+        this.save();
+    }
+};